@kbar Thanks for the reply.
I assume you would want to test these plugins before you release? If so then you must already have all these different versions of Cinema 4D already? They all ship with the SDK in the main C4D installation folder. It is called sdk.zip (for R20 onwards that is).
Yes, we have tested all these different versions with the shipped build, we have got the installer here. However, it may not the oldest version for every independent version.
For example, the version number of the installer for S22 on the download page is S22.123.
I assume that it would have the SDK of S22.001 will be compatible with every sub-version for S22. If it makes sense, just want to know where I could get the 001 versions from the official channel.