Questions like this should be asked in MEHEM's Nexus support thread.
Considering the message at the top of the post says the content is deprecated AND the thread was moved to the Archives section, I'd say it's quite clear. The note also states what references to consult for texture installation, which is what the entire post is about. The contents have no bearing on how to install MEHEM itself. If you have questions about how to install MEHEM, see the MEHEM_Readme.txt in its download.