Thanks everyone for all your answers.
I took another approach altogether : I asked and got a Steam refund, then bought Gunthro on Caravel, then could activate all my keys on Steam - kinda convoluted, but worked... just like a DROD level
Buying Gunthro on Caravel...
got me a free Caravelnet month...
which allowed me to request a Caravel key...
which populated the change location game menu...
which allowed me to download all standalone games I owned as .hold...
BUT, not in the Steam version. In the Steam version, even though the .holds downloaded (at least, the progress bar progressed), they were still not selectable after the download completed, and the download button was still available.
Best regards
[Last edited by pouzzler at 06-16-2019 09:33 PM]