Here's a video on how to manually delete the Preferences file of Photoshop on Windows. There's also a keyboard shortcut to do this, although sometimes it doesn't work. I did send this link to the user. If after deleting the preferences file and if Photoshop continues to crash, please contact me.
I have yet to encounter any function of UltraSeps that can crash Photoshop. There has to be another issue.
The first part of the video goes over a few problems a damaged preferences file can exhibit, you can skip over that if needed to about 1:15. Overall, irregular behavior within Photoshop can often be resolved by trashing the preferences. I've seen dozens of problems with Photoshop that couldn't be explained which magically disappeared after deleting the preferences.
I've also attached a graphic here with instructions on how to reset the preferences by holding down certain keys when starting up Photoshop. As stated above, this is not guaranteed to work.