EPIX 2 Firmware files - where to get them?

Hi everyone,

My family has been using top Garmin Watches for multiple years now and really appreciate the ability for them to work, to acceptable for us levels, "offline".
I do not need to sync, nor using the app, since the EPIX 2, for example, gives me all the data, on the watch, enough to appreciate it.

However, back in the days I could download the Firmware (via Beta file). Today I'm pushed to use Express or the App to update the firmware (my current EPIX 2 - 13.22 one is pretty buggy).
That does not work for me - as such I would like to ask where can I download the latest Firmware for EPIX 2, 6S Pro as well as 6X PRO?
Can someone (Garmin?) help me with direct links?
I have 4 top Garmin watches in my family and we all like to stay "offline" when it comes to most crucial health data.

Thank you.