The problem is solved!! (At least on Windows ME but I think it works on win98 too).
So:
1. Install the Rego's big file.
2. When the licence window popups, choose the server (not the local !) line, and leave this blank. Then NEXT!
3. After the installing copy the MAXIM...lxk file to the new BIN directory and run the Rego's last patch.exe as usual.
4. Run ISIS.exe in BIN at once (it doesn't work yet but makes some reg keys).