When unzipped, this is the contents of the installation CD for version 1.5 drivers & firmware upgrade utility (for earlier firmware revisions).
The 3Com FTP download "AC15CD.EXE" is damaged & will not extract properly. This upload is for the benefit of those who have attempted to download, extract, & use that file from 3Com, only to find the file is "damaged or changed since it was created". (I don't know if 3Com has been contacted regarding this.)
It includes Adobe Acrobat 3, drivers for Windows 95B OSR2, 98, 98SE, ME, & NT 3.5/4.0 . Don't know if Windows 2000 or XP are supported. Check 3Com.com/support for more info on those.