Without direct support, this is going to be tricky. Personally, I like using the cloud managed Cisco Secure Client portal (example for APJC https://secure-client.apjc.security.cisco.com/).
You can select a software train, like "Latest", and it automatically keeps the clients up to date. It also allows you to configure every aspect of the client.
But without a partner involved, it will be hard to get access and get it setup. The portal itself is included in an AnyConnect subscription (which you probably have).
I tihnk your best patch forward would be to buy a Cisco Secure Client AnyConnect support contract via AT&T in your companies name, so you can get direct support, and directly download the clients yourself.