Sage 50 can't locate the form file in the Printer Form Settings

I've recently re-installed Sage 50 onto a new computer and obviously it requires some tweaking.  I use pre-printed 3 part cheques - cheque at top and 2 stubs below. Prior to the reinstall I used to use "invpmtchq.sfm" - this file is not in Sage Accountants Edition 2017.  No matter what I choose for "Description" and "Form" it comes up with an error message saying "Sage 50 can't located the form file in the Printer Form Settings".