Hi Upseted
File Verification is a process for MYOB V19 files (File > Verify Company file) - this process checks the integrity of the file and does not require a subscription etc, and can be switched off or skipped.
You may be referring to file Confirmation, the process MYOB uses to ensure you are using a valid licence. If you have a perpetual licence for the serial number in the company file - 'purchased my software outright many years ago' - then you do not need a subscription to Confirm your company file.
File Confirmation cannot be turned off. Please advise what version of MYOB you are using (see Help > About AccountRight) as the process of file Confirmation depends on what version your are using, and what operating system you are using (windows 10, 7 XP etc)
Regards
Gavin