According to the english CSP facebook page:
"how come english and japanese CSP are two different products? This is not
how most software works, the software should just have multiple language
options. Please stop screwing the consumer."
Response:
CLIP STUDIO PAINT "A multi-language option will e installed in the future.
We appreciate your patience for this inconvenience."
Maybe not the answers some wanted, but the answer they gave could be interpreted different ways.
Maybe they will add english options to the Japanese licenses and then all is solved