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I think, cant be sure though that Sage introduced backward compatibility for the first time in V12 so you may be lucky. Only way to really know will be to do it!
Other options, well Sage does install a read-only ODBC driver so you can extract data from Sage if you are technically inclined but then you would have to put it into the required format. I wrote an export wizard a while back which will extract the bulk of what you need but I cant remember off the top of my head if it does all transactions and ledgers.
Might be cheapest if he upgrades! Most accountants I know run multiple versions of Sage to accomodate their clients requirements