Note that funscript and project file are two different things.
- funscript is .funscript.
- project file is .ofsp.
OFS 3.x use a new project file format so you can’t use an older one. Read here for details. (expand Changes 3.0.0 and scroll down to Change to Projects)
If you don’t have a funscript file with your latest changes for the video then you might need to reinstall the previous OFS version, open the project and export the funscript and then install OFS 3.2.0 and import the video. You can import a video with funscript by opening the video (just make sure it has the same name as the funscript except for the extension) and OFS will create a new project file.