I wasn’t able to reproduce the issue on Aseprite version 1.3.7 on Windows 11. What OS are you using? What other issues are you experiencing besides the extension being installed under the wrong category? Are the new functions not appearing the menus?
I’d recommend:
- Install the extension and restart Aseprite, see if the extension is under the correct category after that and check if the new functions are working correctly.
- Update Aseprite to version 1.3.8.1 (newest stable at the moment).