@ngocson8335
you have to change the Autodesk.iFeatureName.Inventor.addin File for loading lower versions:
<Addin Type="Standard">
<!--Created for Autodesk Inventor 2018 (Version 22.0)-->
<ClassId>{de55ae5b-65de-4465-bbb5-d1617c2ccc9f}</ClassId>
<ClientId>{de55ae5b-65de-4465-bbb5-d1617c2ccc9f}</ClientId>
<DisplayName>iFeatureName</DisplayName>
<Description>iFeatureName</Description>
<Assembly>iFeatureName.dll</Assembly>
<LoadOnStartUp>1</LoadOnStartUp>
<UserUnloadable>1</UserUnloadable>
<Hidden>0</Hidden>
<SupportedSoftwareVersionGreaterThan>20..</SupportedSoftwareVersionGreaterThan>
<DataVersion>1</DataVersion>
<UserInterfaceVersion>1</UserInterfaceVersion>
</Addin>
Please additionally check if the addin files are in the directory C:\ProgramData\Autodesk\ApplicationPlugins\ located.
Regards
Martin
Martin Winkler
CAD Developer
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