Old versions of Elecom drivers:
Mouse Assistant
5.0.2 - https://trackballs.eu/media/Elecom/soft ... _50011.exe
5.1.6 - https://trackballs.eu/media/Elecom/soft ... 516000.zip
5.1.12 - https://trackballs.eu/media/Elecom/soft ... 112000.zip
5.2.10 - https://trackballs.eu/media/Elecom/soft ... 201000.zip
Important information: Elecom software is known to suffer from severe bug - excessive CPU use. According to the Reddit u/hackpadthink user, that could be fixed by switching to the Japanese language afer making necessary configuration changes:
https://old.reddit.com/r/Trackballs/com ... _solution/