Coldy writes:  

The 4images Gallery Installation (integration) Tutorial is now updated for all PHP-Nuke Versions (6.5 - 8.1), CiroxX and RavenNuke 2.4.00.

You can download the new Installation-Tutorial at CyberTipps (registration required).

The 4images Gallery is one of the safest Gallery-Systems with many features.

The plans for the next year are new free templates and modifications.Thanks Coldy!