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You can add Excel-DNA sponsorship to encourage support and future development, with easy billing through a corporate GitHub account.
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Hi Jan,
Yes, it is easy to only build the 32-bit add-in.
For F# projects you can set a property in your project file (the .fsproj file, not the .dna file) to disable the 64-bit build.
<PropertyGroup>
<ExcelDnaAllowPackageReferenceProjectStyle>true</ExcelDnaAllowPackageReferenceProjectStyle>
<RunExcelDnaSetDebuggerOptions>false</RunExcelDnaSetDebuggerOptions>
<ExcelDnaCreate64BitAddIn>false</ExcelDnaCreate64BitAddIn>
</PropertyGroup>
For C# and
VB.NET projects, the NuGet package will add a file called Properties\ExcelDna.Build.props to the project, with the same setting accessible there.
-Govert