Everything was working perfectly fine. Today I got this error message "the specified operation is not allowed on read-only files" anytime and in any files, I am trying to make any changes
Confirm that "Open as read-only" is disabled in the 'File> Open' menu. Confirm that Sound Forge is in the 'normal' edit mode (Edit> Tool> Edit) Try exiting SF and relaunching, and/or reboot the PC. Are the files on a local drive?
btw, welcome to the Magix Sound Forge users community @kdonadze.