The nightly builds allow you to test the very latest developments and bug fixes. The goal is to catch new crashes and regressions before they reach the prereleases or stable versions. For a more detailed description see Comparison of stable, beta, and nightly versions
A nightly build can run side-by-side with other versions of MuseScore on the same computer. If you change the preferences in the nightly build it does not affect your preferences in the prerelease or stable versions of MuseScore. The nightly builds use a cymbal logo to visually differentiate them from normal versions of MuseScore. The cymbal is a play on the fact that nightly builds are likely to crash. If this sounds scary to you, use the latest stable release instead. For the latest stable version of MuseScore visit MuseScore.org.
* If you experience a crash on startup, revert to factory settings by running MuseScore with the =F flag (nightly.exe -F) or via the batch file
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