Start by copying one of your many backups or your Manager data file.
Unfortunately if you have not had a robust backup routine in the past, it is very likely there is not a solution you will find palatable.
If that is the situation you find you self in then the best you can to is backup what you can find and hope you do not destroy anything else while looking / experimenting. Finding and backing up the application data file is your most critical data.
On it’s own that statement does not make any sense but raises serious concerns.
- Is your hardware failing?
- Is some one deleting files they shouldn’t?
- Do you have a virus?
If any of the above are occurring your problems are much greater than getting Manager to work again.
You have to maintain compatibility between
- Manager data file (it is modified by some later versions of the Manager program and these changes can not be undone, you can only use a back up you made prior to using the later version of Manager).
- Manager program. Later versions are regularly released. Versions are specific for operating systems (and 32/64 bit on Windows).
- Operating system
Manager offers good support going forwards, conversely when you can’t go forwards or need to try and go back for some reason much greater user care is required.
The Manager program is well backed up. To restore the version of the program you had on your Mac you will need to know what version you had. Possibly a screen capture, memory of when you last updated it, and some experimenting.