TWU Supports Cisco Anyconnect version 4.8
Taken from the page https://www.cisco.com/c/en/us/td/docs/security/asa/compatibility/asa-vpn-compatibility.html#id_120239
Cisco AnyConnect Secure Mobility Client 4.8 supports the following operating systems.
Windows
Mac
Current Microsoft supported versions of Windows 10 x86(32-bit) and x64(64-bit)
Microsoft-supported versions of Windows 10 for ARM64-based PCs. Support is for VPN client, DART, and customer experience feedback only.
Windows 8.1 x86(32-bit) and x64(64-bit)
Windows 7 SP1 x86(32-bit) and x64(64-bit)
macOS 10.15 (64 bit)
macOS 10.14 (64 bit)
macOS 10.13 (64-bit)
Linux
Red Hat 6 and 7 (64-bit only)
Ubuntu 14.04 (LTS), 16.04 (LTS), and 18.04 (LTS) (64-bit only)