The previous version we have stored is:
http://www.macecraft.com/downloads/RegSupremePro_setup.exe_1.4.0.48
If you download and install this, remember to uninstall the 1.7 before.
I'm hoping to find the time to install Windows 98 to one of our test environments tomorrow and finally sort out the Win9x problem because I don't think it will too difficult to do. Updates to RSPro and RS are coming hopefully in this week.