Inventor addin 2026 to 2025

[mateusz_baczewski]

Hi,

Is it possible to create an add-in for Inventor 2026 and run it in Inventor 2025 without any changes?

Is it enough to just change the reference to Autodesk.Inventor.Interop.dll in the .csproj file?

[marcin_otręba]

yes, you can,  just put addin file into version independent location:  C:\ProgramData\Autodesk\Inventor Addins\,  or put seperate addin files for each inv version in version dependent location

and set inventor interop dll to be version independent:

but be aware that methods and properties added in 2026 version will not work in 2025.

[bradeneuropeArthur]

make the reference to the most lowest one found in this folder:

C:\Windows\Microsoft.NET\assembly\GAC_MSIL\Autodesk.Inventor.Interop

This way you are always sure that it works above the version selected.

[TylerWarner33]

@bradeneuropeArthur Wouldn't the 'Autodesk.Inventor.Interop.dll' need to reference the lowest .NET 8 version, meaning 2025, not just the lowest version?

FYI: Inventor Versions documentation

[bradeneuropeArthur]

Also the framework indeed is relevant here. Most cases framework 4.5 will still work in most cases.

[hollypapp65]

Just make addin for 2025 and it'll work for 2026.

My 2017 addin still work in 2026.

[bradeneuropeArthur]

In most cases yes.