According to IBM Client Access needs V6R1 of Client Access. If you are just needing TN5250 try mochasoft at
there are 2 versions both have 30 day trial, Try TN5250 for Windows first – I have tried on Windows 7 and it works. That way will work on both XP and Windows 7.
If that works I believe a individual license is 29 or 30 dollars and only 300 for a corporate unlimited license.
The main problem with Windows 7 and older versions of Client Access is 1 the CHM files are not by default available on Windows 7 need some kinfd of Microsoft download.
On the IBM site or if you google there is a document that talks about Client access and Windows 7.