This Long Term Support version is considered as very stable. Recommended for those not in favor of the latest cutting edge features but rather those looking for security only, bug fixes and long term stable features.
Tiki 18 brings new features such as H5P, and refinements and extensions of existing features, along with continuing overall improvement in the Tiki code.
Learn more about the development here.
All versions (including the unsupported previous ones) are available from https://sourceforge.net/projects/tikiwiki/files/
Tiki is provided as a one-click install by most script managers (for example, Softaculous) and remote installers (such as SimpleScripts). These auto-installers are offered by nearly all web hosts and control panel (cPanel) applications, and make it easy to install and upgrade your Tiki.
See 1-Click Installers for more information, also check recommended and friendly hosting solutions
Bitnami provides a full stack installer for Windows, Mac OS, and Linux. It includes PHP, My PHPAdmin and MySQL in the installation so these do not have to be set up separately. It provides an installation of the latest stable release of Tiki, and instructions for upgrades.
Further information can be found at Bitnami Tiki Wiki.
To install Tiki from the Windows Web App Gallery, visit Microsoft Web Platform installer. Tiki Wiki CMS Groupware is included in the Windows Web App Gallery and can be installed with the Microsoft Web Platform Installer.
The URLs at SourceForge usually end with /download, which causes
wget to use download as filename. For a more convenient download use syntax
wget --trust-server-names to save with the proper filename. More about this topic at http://sourceforge.net/p/forge/community-docs/downloading-via-cli/.