I checked out the MSTrenches theme and it appears to be compatible with any phpnuke version.

You can download it by going to this section ---> Nukemods Themes

Then click on Page 3....Click MSTrenches...Click Download....

Extract files...then click through all folder until you find MSTrenches

_Exact Directory_ - Follow path to folder...

html/themes/MSTrenches (folder) this is the folder that you want to upload to your nuke directory....(themes)..

Hope this helps..

FYI - Don't forget to upload the block-MSTrenches.php file to the Blocks Directory on your site...