There is a way to force your computer to load print artist 4
Click on display /settings & reduce colour quality to 16 bit & reduce your screen resolution to 800X600
Then insert the Printartist disk & select install, as before you will see the Sierra logo on your taskbar but it won't move or do anything.
Now put your screen settings back the way they were before & you should see the install screen jump off the taskbar so you can access it.
It will test your computer & tell you it fails as it can't recognise newer technology but ignore that & select 'install anyway' & all should be working
vic