You can't.

Your option would be to contact Intuit to see if they'll cut you a deal on the 2018 software, then enter each client's info into the 2018 software (which, would be a good idea anyway - that's my M.O. with any new client and then generate organizers that would show the prior year info (which, to me is invaluable).    

OR, if you can get the 2018 software at a reasonable price - you could use it to generate blank, generic organizers (they wouldn't have prior year numbers tho...)

If neither of the above work,  CFS TaxTools and The Tax Book both have generic organizers.