The delisting of the Meridian series was a particularly bizarre instance of DRM-related breakage. According to the dev:
"I was about to get ready to bring the [version 1.05] fix to GOG as well, but the creators of the SunBurn engine have suddenly stopped supporting their engine and have shut down their activation servers. This means I can no longer validate my SunBurn Studio license and therefore, cannot ever build the patch. The code is there, the fix is ready, but I can't make an EXE file out of it to upload to GOG.
"I even tried contacting the former SunBurn devs, but they never got back to me :/ "