With the new move to Steam upon us and the current launcher no longer in effect, I decided to uninstall and then poke around to see if there were any leftover files. I wasn't particularly surprised to see the data in these hidden folders not cleaned up, but I was surprised at the volume of them. For those of you who are tight on space, it might be good to clean these up before downloading the new version for Steam. Not sure if this is something Intrepid can provide the user the option to clean up on uninstall in the future?
Windows path: C:\Users\<your_user_name>\AppData\Local\
EDIT:
I see it mentioned here, there are additional files to be deleted and it is properly documented, thanks!
https://support.ashesofcreation.com/hc/en-us/articles/4402749120787-How-to-uninstall-and-remove-all-files-for-Ashes-of-Creation-Alpha