Old versions of Kensington drivers:
MouseWorks
5.61 - https://trackballs.eu/media/Kensington/ ... s_v561.zip
6.2.0 - https://trackballs.eu/media/Kensington/ ... s_v622.zip
TrackballWorks
1.0.4 - https://trackballs.eu/media/Kensington/ ... s_v104.zip
1.3.1 - https://trackballs.eu/media/Kensington/ ... s_v131.zip