The Virtualmin app installer offers a few versions of Tiki Wiki CMS Groupware, the most recent being 19.x
The latest stable version is 22.x -> https://tiki.org/download but I suggest to only offer Long Term Support (LTS) versions, the latest being 21.x LTS, and in the future 24.x LTS. Tiki 21.x LTS is supported until March 2025: https://doc.tiki.org/Tiki21
Tiki started in 2002, and since 2009 offers Long Term Support (LTS) versions. The time-based, "Release early, Release often" approach with LTS versions permits to balance the needs of stability and innovation. Please see: https://tiki.org/Versions
For a flashback to 2005, please see: https://forum.virtualmin.com/t/tip-create-new-script-installers-for-your...
I am a contributor to the Tiki community so I am happy to help in any way.
WikiSuite.org Founder, Tiki.org Admin, EvoluData.com CEO