As of today the latest stable release is playSMS 1.4.3. This version is very important, it contains fixes to critical security vulnerability. If you have installed and currently running previous version such as playSMS 1.4.2 then you must upgrade it immediately.
Upgrading playSMS is about replacing all files and folders, and run an SQL DB upgrade. Upgrades in playSMS rarely deleting old files, more like modifying them so that you can just replace them with the new one, unless ofcourse specifically said otherwise.
This article is a guide for howto upgrade previous version of playSMS. You already have a working playSMS and its one-version behind the latest stable release, for example you have 1.4.2 installed and now released 1.4.3.
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