Generally you're required to have the pro license to have access to the full history of old versions, but send an email to support [at] tasharen.com and make your case, then ArenMook might let you have a version.
For future reference, if you suspect something like this to happen, and you're on a standard license, remember to keep your own version backup of the relevant versions, since your license technically doesn't give you access to other versions than the current.