I've been a pro-advisor for ages.  I have a couple ideas.  I've got this problem myself since my own files are on Enterprise but thanks to the TIER pro-advisor program, I no longer get Enterprise updates as part of my exorbitant software fees! To keep my payroll running, I've got to downgrade.

I recommend starting a new company file based on the old company file and copy the chart of accounts and as much information as it will let you. This option is available on version 2022 (I don't know about anything older). Using excel and the import/export features then set up your vendors and customers (parts if you have them).  The basics of the employees will come over, but there will be much payroll set up for tax payments etc. yet to be done. The Starting balances can be journaled  in for most accounts.

I have found that re-entry of open invoices for the A/R and A/P (for small business) can be faster than fussing with 3rd party or import/export  features that are available.  

If the vendor and customer list are outdated, you can edit this list in Excel prior to importing it into your fresh new company so you can clean up a bunch of old trash on your lists and cure out of balance errors on the balance sheet.  The Enterprise Solutions detail of the transaction history will still be there - comparative reports will be a problem at first since the old history will be in the Enterprise file.  After a fiscal year - it should be smooth sailing.

For large businesses I would recommend hiring an expert who is experienced and allowing them their 3rd party software of choice to help you with the coversion.