[Zope-PTK] cannot install PTK

[DETKE WOLFGANG]

Hallo everybody,

I´m looking for a System to build an Intranet and I find Zope
Now I will setup Zope on an RedHat 6.2 -Linux-System with the PTK.
After the installation of the ZopePTK-07.1.tar.gz there ar the PTKDemo and
PTKBase folders in lib/phyton/products but these products are not listen in 
Product-Management in Control_Panel/Products.
Other Products ( e.g. ZSiteMap) could not be installed ( "no module named
Renderable") but the file exists in lib/products ....
What´s going wrong here?
Any answers are welcome.
Thanks
Wolfgang. 
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