Is it possible somehow to use the official English translation with a Japanese serial somehow? I'm grateful for the fan translation but using it can be frustrating. I've tried to e-mail them a few times to convert my key to English version but they refuse to, and I hate having to buy it again especially as I supported them early on and struggled through the only version available.

It looks like 742DEA58-ED6B-4402-BC11-20DFC6D08040 is the file which triggers the Japanese key not working. Everything else in the English install works?
This is probably old news to people here.
I installed official English version, and then replaced 742DEA58-ED6B-4402-BC11-20DFC6D08040 from the fan translation to the English folder for it, and it works. If you delete the CELSYS folder from Documents and then open CSP fresh it will give you all English tools too, which is nice. Only thing that is missing is the actual language in the program's menus. For example, things that bother me are such menu option as "Integrated images and export" instead of what it should be "Export (Single Layer)"
Basic tests seem to work but there may still be issues somewhere.
If anyone has an idea on what to edit in the official 742DEA58-ED6B-4402-BC11-20DFC6D08040 to make it work with JP license that would be best...
Looks like license verification wants to still check against English license. So it will only work until it wants to verify again... not sure what triggers that. Requires to install JP version again again, verify, then switch back to EN.