Just chiming in as well to mention two alternatives, for anyone who is looking.
Lately, I’ve been using an extension called UniV. I’ve been pretty happy with it, seems to do everything I need it to and is feature parity with what I’ve wanted out of Textools! I have also just been introduced to another called Mio3 UV, it looks incredibly robust and I am looking forward to testing it out myself here sometime soon.
UniV: https://extensions.blender.org/add-ons/univ/
Mio3 UV: https://extensions.blender.org/add-ons/mio3-uv/
