"What about the VST2 plugins you own that are no longer being actively developed or supported?"

I wrote to support yesterday asking to clarify what do they mean by "compatibility". I have a few dozen projects in Cakewalk that have VST2 version of Halion. My worries, that projects will not open in later years, the ones that have VST2 version of plugin, since even if I retain copies of installers it might not authorize original license through their e-licencer, making plugin unusable.

Sonic Halion is the most advanced GM synth available today as far as I know, and quite a few people (including me) are using it within BIAB... and as we know BIAB does not support VST3... as of now.

I will share their answer if/when they reply.