A final release will not have any "-beta" suffix. For example,

"unRAID Server 4.0" is the final release of version 4.0.

In the past, the <major> number was incremented each time the underlying linux kernel version being used by unRAID Server changed. This may not be the case moving forward though because of the rapid development of linux lately.

The <minor> number is incremented of course when new features and/or bug fixes are added.

When a new release has been developed it will first undergo a beta testing period. Beta releases are tested by a number of highly knowledgeable users within the unRAID Server User Community Forum . The first beta release will have the suffix "-beta1" appended to the version number. Hence, the first release of version 4.1 will actually be "4.1-beta1".

There may be several beta releases before we're confident that all the bugs associated with the new release have been ironed out (especially if the version is a new <major> number). Once the final release is ready, the "-beta" suffix is dropped.

There is a possibility of a version number of the form: <major>.<minor>.<patch>
This would be used if a serious bug in a final release was found.

The download zip file for each release includes a readme.txt file that provides installation instructions and a change log. This information is also available in the release announcements on the unRAID Community Forum.

The version number appears in the upper right corner of the System Management Utility Main page.