OK I see there's no reply so far. Here is the best workaround I came up with so far, using free software:
1) Install Oracle VirtualBox
2) Install an up-to-date version of Linux on VirtualBox (I used Debian)
3) Install F5 client for Linux on the VirtualBox
4) Connect to the VPN through the...
The F5 Big-IP Edge VPN client seems to be available only for Windows 10. I think this has been the case for the past ~half year or so. Is there any way to use this client from Windows 8.1 anymore? Or is there any workaround for connecting to a VPN that uses this software?