This article will help with the download URLs for the SonicWALL VPN client as well as Cisco AntConnect.
Sonicwall VPN Client
https://www.sonicwall.com/products/remote-access/vpn-clients/
Cisco AnyConnect VPN Client
https://www.cisco.com/c/en_be/products/security/anyconnect-secure-mobility-client/index.html
Check the download folder to make sure client properly been downloaded.