If you like to test the latest development versions of Znuny and Znuny LTS this is the right place. Download the tar.gz file and use it like every regular version. If you test (patch level) update don't forget to run the migration script. The files are generated every night. If you find a bug please use the version number from the file name when reporting. The version number for nightly builds has the format MAJOR.MINOR.PATCHLEVE.YEAR.DAY_OF_YEAR and is always lower than the next coming release.