Thanks, Technotiger, but: I had tried that forum already. Lemoto says: "You will find GI80.DLL here [hyperlink], until I think to remove it." That was April 2003, and Lemoto seems to have thought to remove it in the meantime. The link takes me to "There was no page found at this location."
Revised statement of original prob: GI80.dll wasn't missing; it's just that it wasn't located. PagePlus wasn't looking for it in the right place (and neither was I). So, in case anyone else has the same problem: (1) create System Restore Point (a precaution); (2) using (eg) Windows Explorer, locate GI80.dll in C:\Corel\Suite8\Programs, and copy (CTRL-drag) to C:\Program Files\Serif\PP60\Program folder - or with variations according to your own set-up. Thanks again, TechnoTiger, for your effort to help. Mea Culpa.
This thread is now locked and can not be replied to.