If you need to use the Cisco Anyconnect client for using your school's vpn, you can use an open source and much lighter weight client called openconnect - MIT reccomends using it in their IT documentation.
To install on macOS:
- Install openconnect
brew install openconnect
- Install the macOS TUN/TAP driver
I had no problems using it, other than not being a student anymore!
Alternative instructions: https://gist.github.com/moklett/3170636