Win3.11 3-button serial mouse driver - which/where?

... I don't know if there was a pack like Office in that years...

Yes there was, MS Office 4.3, 24 3.5" floppy disks.  Copied them all to a backup drive.  Each folder named "Disk1", "Disk2", etc, so it knows the volume label for successive disks.  I installed it once to a computer with no optical or floppy drive.  Most files are dated 1994.  Most of the 24 disks are cabinet files (*.cab).