Update missing from Support page on beta app

My chromecast with google tv, HD version, has the beta app installed (Beta (12.1.2119)). The Support page is missing the two update links which do appear on my other two CCwGTV's (4K) with beta app. The app name appears as Beta in the apps list on the two 4K CC's but doesn't show Beta in the apps list on the HD CC, even tho the version number is the same on all three. I've removed almost all other apps in case storage was a problem. How will I be able to update the beta app on the HD CC?

The beta has to be sideloaded.

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