For wooby6's CG installer (
Found here);
I also wasn't able to get the Full-CG "Install.bat" to work but the steps for the manual install (detailed in the note.TXT) work perfectly. Basically after running the game at least once you'll generate the initial event.dat then these step to unlock gallery.
Locate the “event.dat” in “%LOCALAPPDATA%\Sissy_Maker_Full”
Rename it something like "(old)event.dat" then open it with Notepad
Select everything before the "ey" and copy (the ey were about 6 characters before the end for me with a fresh event.dat)
Now open the CG.dat, included in wooby6's archive (in the data folder), with Notepad as well
Paste what was copied from your event.dat and "Save As" event.dat then move it to the appdata folder (or save it directly to there)
Having a local method to do this unlock is certainly the best option as I do have an ever increasing paranoia than anything online can disappear at any moment; so cutting the need for OnlineSaveEditor is a plus for me.