Why does enabling pre-release updates not offer the build I expect?

Ordinary pre-releases and internal pre-releases are separate update channels. Open Settings > Application > Updates, enable Receive pre-release updates, then enable Receive internal pre-release updates if you specifically want internal builds. Run Check for Updates and read the result in About.

A channel preference allows BetterDisplay to offer matching releases. The update feed determines which builds are available for your processor architecture. Some internal releases are available only as direct downloads. A failed check is different from a successful check that finds no update.

Internal builds can contain unfinished or experimental changes. If a requested build is not offered, check the official BetterDisplay download information for its availability instead of assuming that repeating the check will expose it.

Turning a test-channel preference off does not immediately replace an installed test build with a stable build. An installed pre-release retains pre-release eligibility until a stable release replaces it. An internal build similarly retains internal-channel eligibility.

Check the stated release channel rather than relying only on the version number or download filename. A release candidate can use the same app version string as a stable release. BetterDisplay’s built-in updater uses the update feed’s channel information together with its eligibility settings. A third-party updater that uses only the bundle version can classify the same release differently.

See Updates for channel behavior and installation choices.