I don’t understand this statement. Both customers and suppliers can be linked to either payers or payees on both receipts and payments. The Other type of payer or payee allows free text entries. The purpose of the change was to allow customers/suppliers to be entered as payers/payees. And that is now possible.
This is the second time you have made this false statement. In another thread, I gave an example of one business in which suppliers are not necessary. I was arguing for the necessity of being able to enter payers/payees who are not defined as customers/suppliers. I never said I do not use customers and suppliers. And I gave a hypothetical example of an all-cash business.
You can fix this after you update. I also wrote about that in the other thread. All you need to do is (1) sort the Batch Update spreadsheet by Contact (purely for convenience in using the spreadsheet fill functions), (2) enter or fill CUSTOMER or SUPPLIER in the PayerPayeeType column for each transaction, and (3) fill the UUIDs in the Customer and Supplier columns. You may need to convert one transaction for each customer/supplier manually to determine what the UUIDs are. From there, you can fill down, fill up, or copy and paste to complete the other rows. I retroactively converted all my old receipts and payments for six years worth of accounting records from all my businesses to show customers/suppliers in the payer/payee fields (where appropriate) in about 10 minutes. In the same process, I determined which I would leave as Other type payers/payees.