[quietlybrilliant]

I side-loaded Android P earlier this year, using adb, but now can't update to later versions because the OS doesn't see updates when I check for them.

What can I do to fix this? It's very frustrating, because many of the current apps are not compatible with my old version of Android P anymore and I'm getting error messages every time I launch an app.

[hallux]

You should roll back to Oreo then enroll in the beta - https://developer.android.com/preview/devices/

[Rukbat]

Or unenroll in the beta, because P is out for people to find bugs in, it's not meant as the version you run in your daily driver. That's what beta test means - "We think we got all the bugs out, but if we missed any, let us know". Evidently you found one.

[ptkelly]

And remember, beta versions don't get monthly security updates.

[LeoRex]

Just side load the June P update... Worry about OTAs when it gets released, then load the full image in fastboot... If you don't have a Big Red Devil model with a locked bootloader.