About OS that is no longer supported
It is forbidden to connect to the JAIST network, from a terminal running an OS that is no longer supported.
Continuing to run such OS might cause security risk such as virus , malware, data leakage threat etc, due to security update for the vulnerability isn't applied.
Additionally, once such OS is infected , the infected PC might be controlled to attack the other system.
Don't forget to upgrade OS or buy the new PC.
Microsoft support of Windows7 officially ended on Jan. 14 2020.
Microsoft support of Windows 8.1 will be ended on Jan. 10 2023
For the PC's belonging to JAIST, EES license is available to install windows 10. Please refer the following link.