Hi Fireman26 , if you select "Open your MYOB file", with luck it will open the last used folder, and you should see a data file, in the name of your business, with an extension .prm. If there's more than one, look for the most recent.
See if you can open it. The default username is Administrator, no password. But if you know a password, use that. If the file opens, select Set-up, Company information, and make a note of the serial number. Then call MYOB and ask for help with upgrading. Current programs are only available on subscription, so they will send you a quote.
If you can't open the file, make a zipped copy of it, then call MYOB and ask them to remove the password and ask for help with upgrading.
Post back with results.