In the Calibre numbering scheme '5' is less than '44' !
Also with Calibre then genuine beta releases are actually very rare. What there is a weekly release cycle that combines increments in functionaliy with fixes produced during the last week for any issues found. This can means that no release gets exhaustive testing - if an issue is identified then a fix can normally be expected within the week.
As a result it is always a good idea to keep the download of the last version that worked OK for you in case the weekly updated causes you a problem and you want to revert. In some ways the RAD (Rapid Application Development) methodolgy used by Calibre is a bit like a perpetual beta. This does mean you can have short term problems identified, but it does mean extremelybrapid improvements in functionality. This approach also lends itself to having a distributed team of developers each working independently on their own areas of interest within Kovid providing overall stewardship.
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