yeah I tried that and got the same error message, but only after it had got my hopes up and said it was going to convert the .mny file to the latest version !
I've also tried exporting the individual accounts as .qif files and then using the Restore Account option on the new machine.
It was all looking sort of promising, but it appears to have just duplicated all the transactions when loading them, and also didn't load any of the categories, so I'm gonna have to clear down all the accounts in the new version and start again from scratch I recon. :-(
I've finally managed to get 30 years of detailed transactions out to excel using the report function (and that threw a number of errors) and probably just going to have to keep that data in excel for historical analysis.
Been on this now for 9 hours solid and just about ready to throw in the towel.