Important notes

Requirements
This release has been tested with MySQL 5.7.21 and PHP 7.2.4. Minimum requirements are MySQL 5.5 (earlier versions may work but are unsupported) and PHP 7.0. Also note that MySQL versions 5.7.3 through 5.7.7 will generate installation errors due to an erroneously-deprecated feature on MySQL's part. Please avoid using these versions (this release was tested with 5.7.21).

Upgrading from 1.3.7 to 1.4.1
Note that 1.4.1 requires PHP 7.0! You will need to have PHP 7.0 running prior to accessing the upgraded site to initiate the upgrade.

Upgrading from 1.2 to 1.3.7
Some CSS changes have been made to the themes, so as always, please make a backup of your default, light, and/or kubric themes if you have customized them.

Also, the 1.3.6 installer now backs up the standard installed files in config/, as these have changed significantly. If you have modified your menus, you will have to manually merge your changes into the new installed config/ files. Upgrading from 1.1.x to 1.3.7
As of 1.2, WikkaWiki incorporates new support for modularized themes. A new file hierarchy has been introduced, and the old css/ directory is going away. It is imperative that you make a backup of your css/ and templates/ directory BEFORE attempting to upgrade, if you have customized your site theme! Failure to do so will most likely result in a loss of part or all of your theme changes. It's always good practice to back up both your Wikka install directory and your database prior to any upgrades.

Since 1.1.6.6 WikkaWiki has supported a plugins/ directory that is guaranteed not to be modified by the installer/updater. While it's important to backup any customized themes or actions, you should really be putting these into the plugins/ directory.