You really need to get setup to download AnyConnect directly from software.cisco.com. Those links were provided as a convenience, and I'm not even confident they will remain (I keep arguing they are needed to make it "Meraki Simple").
If you have Cisco Umbrella, then you should move directly to using the Cisco Secure Client via the SecureX portal. This system is far more automated and allows centralised control and updating of all the AnyConnect clients. It even lets you push profile updates.