Hi @tamas.deri :
you can change .csproj file , this is my one project config is a older version but you can change it by youself . and the base is create mutiRevit debug/relase version in debug management and when modify this the framework will change.
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{FBBB7AFE-3CF9-42D9-A95C-0BD2CF3CAC3D}</ProjectGuid>
<OutputType>Library</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>ReCheckModelAllPlatform</RootNamespace>
<AssemblyName>ReCheckModelAllPlatform</AssemblyName>
<TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<Deterministic>true</Deterministic>
<TargetFrameworkProfile />
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'R2016|AnyCPU'">
<DebugSymbols>true</DebugSymbols>
<OutputPath>bin\R2016\</OutputPath>
<DefineConstants>TRACE;DEBUG;R2016;R2017;R2019;R2020;R2022</DefineConstants>
<DebugType>full</DebugType>
<PlatformTarget>x64</PlatformTarget>
<LangVersion>7.3</LangVersion>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'R2017|AnyCPU'">
<DebugSymbols>true</DebugSymbols>
<OutputPath>bin\R2017\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<DebugType>full</DebugType>
<PlatformTarget>x64</PlatformTarget>
<LangVersion>7.3</LangVersion>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'R2019|AnyCPU'">
<DebugSymbols>true</DebugSymbols>
<OutputPath>bin\R2019\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<DebugType>full</DebugType>
<PlatformTarget>x64</PlatformTarget>
<LangVersion>7.3</LangVersion>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<TargetFrameworkVersion>v4.7.1</TargetFrameworkVersion>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'R2020|AnyCPU'">
<DebugSymbols>true</DebugSymbols>
<OutputPath>bin\R2020\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<DebugType>full</DebugType>
<PlatformTarget>x64</PlatformTarget>
<LangVersion>7.3</LangVersion>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<TargetFrameworkVersion>v4.7.1</TargetFrameworkVersion>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'R2022|AnyCPU'">
<DebugSymbols>true</DebugSymbols>
<OutputPath>bin\R2022\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<DebugType>full</DebugType>
<PlatformTarget>x64</PlatformTarget>
<LangVersion>7.3</LangVersion>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<TargetFrameworkVersion>v4.7.1</TargetFrameworkVersion>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'R2016R|AnyCPU'">
<OutputPath>bin\R2016R\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<Optimize>true</Optimize>
<DebugType>pdbonly</DebugType>
<PlatformTarget>x64</PlatformTarget>
<LangVersion>7.3</LangVersion>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'R2017R|AnyCPU'">
<OutputPath>bin\R2017R\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<Optimize>true</Optimize>
<DebugType>pdbonly</DebugType>
<PlatformTarget>x64</PlatformTarget>
<LangVersion>7.3</LangVersion>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'R2019R|AnyCPU'">
<OutputPath>bin\R2019R\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<Optimize>true</Optimize>
<DebugType>pdbonly</DebugType>
<PlatformTarget>x64</PlatformTarget>
<LangVersion>7.3</LangVersion>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<TargetFrameworkVersion>v4.7.1</TargetFrameworkVersion>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'R2020R|AnyCPU'">
<OutputPath>bin\R2020R\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<Optimize>true</Optimize>
<DebugType>pdbonly</DebugType>
<PlatformTarget>x64</PlatformTarget>
<LangVersion>7.3</LangVersion>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<TargetFrameworkVersion>v4.7.1</TargetFrameworkVersion>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'R2022R|AnyCPU'">
<OutputPath>bin\R2022R\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<Optimize>true</Optimize>
<DebugType>pdbonly</DebugType>
<PlatformTarget>x64</PlatformTarget>
<LangVersion>7.3</LangVersion>
<ErrorReport>prompt</ErrorReport>
<CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
<TargetFrameworkVersion>v4.7.1</TargetFrameworkVersion>
</PropertyGroup>
<ItemGroup Condition="'$(Configuration)' == 'R2016' or '$(Configuration)' == 'R2016R'">
<Reference Include="AdWindows">
<HintPath>..\libs\Revit2016\AdWindows.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="RevitAPI">
<HintPath>..\libs\Revit2016\RevitAPI.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="RevitAPIUI">
<HintPath>..\libs\Revit2016\RevitAPIUI.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="ManagedMC3">
<HintPath>..\libs\Revit2016\ManagedMC3.dll</HintPath>
<Private>False</Private>
</Reference>
</ItemGroup>
<ItemGroup Condition="'$(Configuration)' == 'R2017' or '$(Configuration)' == 'R2017R'">
<Reference Include="AdWindows">
<HintPath>..\libs\Revit2017\AdWindows.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="RevitAPI">
<HintPath>..\libs\Revit2017\RevitAPI.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="RevitAPIUI">
<HintPath>..\libs\Revit2017\RevitAPIUI.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="ManagedMC3">
<HintPath>..\libs\Revit2017\ManagedMC3.dll</HintPath>
<Private>False</Private>
</Reference>
</ItemGroup>
<ItemGroup Condition="'$(Configuration)' == 'R2019' or '$(Configuration)' == 'R2019R'">
<Reference Include="AdWindows">
<HintPath>..\libs\Revit2019\AdWindows.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="RevitAPI">
<HintPath>..\libs\Revit2019\RevitAPI.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="RevitAPIUI">
<HintPath>..\libs\Revit2019\RevitAPIUI.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="ManagedMC3">
<HintPath>..\libs\Revit2019\ManagedMC3.dll</HintPath>
<Private>False</Private>
</Reference>
</ItemGroup>
<ItemGroup Condition="'$(Configuration)' == 'R2020' or '$(Configuration)' == 'R2020R'">
<Reference Include="AdWindows">
<HintPath>..\libs\Revit2020\AdWindows.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="RevitAPI">
<HintPath>..\libs\Revit2020\RevitAPI.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="RevitAPIUI">
<HintPath>..\libs\Revit2020\RevitAPIUI.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="ManagedMC3">
<HintPath>..\libs\Revit2020\ManagedMC3.dll</HintPath>
<Private>False</Private>
</Reference>
</ItemGroup>
<!-- start you code --!>
</Project>
LanHui Xu 徐兰辉
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