Can't connect to download folder

Introduce some solutions, so please try them in order from the top.

1. Change the connection method of SRAS VPN
There are mainly VPN connection methods, GlobalProtect and SSTP.
If you are currently using GlobalProtect, change the connection method to SSTP,
and if you are currently using SSTP, change the connection method to GlobalProtect
and try connecting to SRAS VPN.
After that, please access the download server.
For details on how to set each VPN connection method, see the following pages.
https://web.sic.shibaura-it.ac.jp/SRAS_VPN

2. Change access destination
I would like you to try accessing
"download2.sic.shibaura-it.ac.jp"
If you can connect, I think that there is a download folder there,
so you can click on it to access the target page.

3. Clear credentials
Go to Control Panel and go to
User Accounts → Credential Manager
and see Windows Credentials on the Credential Manager page.
The Windows credentials may still have old credentials.
In that case, please delete the old credential and restart the PC.
After restarting, I hope you will try connecting to the download server again.

4. Disable firewall
Communication may be blocked by the firewall of OS such as Windows software or Windows.
Try stopping each firewall.

5. Use of ywi
If you still can't connect after trying the above methods,
I hope you can connect to the windows server at the university.
As for the remote desktop client,
it is necessary to install the application as standard equipment on Windows
and the application on other OS.
If you can connect, enter
"\\download2.sic.shibaura-it.ac.jp\download"
in the explorer on the remote server and copy the relevant installation file to your PC. 
[Remote desktop connection method]
(Windows)https://web.sic.shibaura-it.ac.jp/Remote_desktop_win
(MacOS)https://web.sic.shibaura-it.ac.jp/Remote_desktop_mac