S
Sega Chief
Guest
Depends on how it was installed. If it's the IRO, you can deactivate it. If it's the installer, you need to either do a file validation to restore the files (Steam) or reinstall (1998). If you made a backup copy of the data folder before installation then you can revert that way (I typically keep a default copy of the Data folder so I can quickly swap between NT and default for testing).
Also, you can try this installer to revert affected files to default: https://mega.nz/file/i50xQRaZ#_tqb7dQiZgyH0TMOC5cjK-DTRe98aVfU8vO4T2AEs7w
Save files will function from NT to vanilla, though you may see some visual glitches with the exp gauges; these correct once the character levels up.
Also, you can try this installer to revert affected files to default: https://mega.nz/file/i50xQRaZ#_tqb7dQiZgyH0TMOC5cjK-DTRe98aVfU8vO4T2AEs7w
Save files will function from NT to vanilla, though you may see some visual glitches with the exp gauges; these correct once the character levels up.