Thank you for wanting and trying to help. But unfortunately, it was on this game that your utility did not work for me, and what is noteworthy is both on the current 0.18.5 version, which is on RenPy 8.0.1, and on the last 0.17.8 version, which was on RenPy 7.4.11. On all other games that were on my computer, the utility successfully saw python, although they are all on RenPy is below version 8.
I have been translating RenPy games for several years, but I only felt problems with UnRen.bat now that RenPy has been updated to version 8. This is not my personal opinion, I see it in the community of translators who have also encountered this.