2. Registration error during 7th Heaven first time launch on registering subscriptions -
Deleted data in %APPDATA%\7thWorkshop\ folder then granted Admin privileges to 7thheaven.exe (right-click run as admin) eventually just Right-click->properties->compatibility->Run as admin perma change as there are other times it needs it.
Good call. This should help quite a few people out as many issues can stem from the program running without admin privileges.
5. Downloads never finish or error out
This was the second most annoying issue aside from DPI. Easiest thing I found to fix it is to simple start a download and if the kb/s or bar doesn't change after a few seconds then right-click->Cancel on it (in the download window). This will cause it to immediately cycle and try again. I had to do this at least once per file after a few files. Never download more than one thing as it can cause an out of memory error when the thing fails a download and repeat-cycles due to it adding the error in the status box in the main window constantly without clearing out old messages..eventually crashing at max limit. There's also a manual download option if you get stuck.. you open up http://pastebin.com/raw.php?i=dDBkYkDu and find the google drive url id to the file you want and plug it into the end of this url https://drive.google.com/file/d/ then download the file to 7th Heaven and replace the broken download that's already in there (in FF7 Folder it'll be prefixed with a GUID).
I finally figured this one out a few days ago. I couldn't download large files (media - music and sound, field textures 1, media - movies) via the 7th heaven manager and went searching through files and trying different things to determine the full download link. My understanding is that if you do things this way 7th heaven will not be able to check for updates to file obtained through this method, so you will have to manually check for updates to those files. Its not a big issue, and in my opinion is much better than doing without some of the larger files that some people have issues downloading.
10. Crash at flashback well scene with Tifa and Cloud
I eventually had to remove all script mods and not use OpenGL update in order to passed this part. No idea why.
Interesting. I wonder if this might be a load order issue? I hate for you to miss out on those mods.
I am also curious which OpenGL update you are referring to. As far as I can remember installation of 7th Heaven only involved a compatibility patch to FF VII and the installation of 7th Heaven itself followed by some configuration. If a second OpenGL driver (or a patch) was installed over top of what is provided through 7th Heaven that could be your issue.