There is only one autosave file: C:\Users\[user name]\AppData\Roaming\NCH Software\VideoPad\autosave.vpj.
You will be prompt to load the auto-saved project if VP detected it when start up. It will be deleted if VideoPad shutdown normally.
In your case, unfortunately it's already deleted if you don't get prompt when VP start up.
Autosave was never designed as a backup file. If VP don't delete the autosave file, there will be too many on the disk without you even notice.