create addin using interop 2017

[sylbat]

Hi,
I have used your tutorials "04 Selected objects" to create an add in of my own. This has been done using the integrated interop which are version 2020. I have a running version of SW 2020 on my laptop. The addin is finished now but I just learned that the users that should be using this addin are running SW 2017.
I tried to replace the interop 2020 with the 2017 ones, but I cannot regenerate the project in Visual Studio. The error I'm getting are all missing components.
Example :
error CS0246: The type or namespace name 'IAdvancedHoleFeatureData' could not be found (are you missing a using directive or an assembly reference?) - Project AngelSix.SolidDna - File FeatudeAdvancedHoleWizardData.cs - line 8 and line 15
I have 24 other similar messages for other features.
How should I proceed ?
thanks for your help.

[brinkdinges]

I'd better answer this late than never. The DLL version that you use does not have to be the one that the user has. I use SW2021 DLLs and my add-ins still work on SW2017. I added SW2021 features to SolidDna a while ago, so you should keep those DLLs.

When SolidWorks starts your add-in, it already has its own DLLs loaded so it will ignore yours. But for the add-in to work perfectly, you should avoid using any features that are newer than SW2017. I do the same, and all of my bookmarks are to 2017 help pages to minimize the chance of me using newer APIs.

I also have a check in my installer that prevents users to install the add-in if they have SW2016 or older.