An Accountant's Copy file can only be used in QuickBooks Accountant Edition. To upgrade to Accountant Edition visit
and click the Products tab.
If you open the file in a different edition of QuickBooks you won't be able
to work on the company file at the same time as your client, and he or she will
not be able to import your changes automatically.
You will need to communicate with your client about how to proceed. You may
want to discard this Accountant's Copy and have your client send you a backup
or portable company file of the company
data. Alternatively, you could convert the
Accountant's Copy to a regular company file.
In either case, communicate with your client about how he or she can manually
enter any changes you make to the company file.