I downloaded preenv 0.1.2 from the repositries and whenever I want to install it the appman gives an error stating incompatible application package

I can't use apt-get because I want that specific version and not the last version and I dont have internet on my n900 atm.

Thanks

App Manager will only handle apps that are tagged as being user-visible, which preenv is apparently not. You should be able to use dpkg to install it from the command line though.

and how to use the dpkg thingy ? :S

You'll need to be root first (make sure you have rootsh installed, then run either "root" or "sudo gainroot"), then:
EDIT: The downside to using dpkg is that it doesn't handle dependencies, so it's always safer to use apt-get (or app manager) if you can.

well i've already tried app manager but failed to install .deb files

and yeah if you can then explain that apt-get thingy

Since you don't have internet in your N900 you can just use dpkg because apt-get needs a internet connection to solve those dependencies.

ammmm , disagreed , i have internet !

What errors do you get exactly? Don't describe it, post it!

"apt-get install packagename" will install a package. You need to know the actual package name though, rather than the name presented in App Manager.

"apt-cache search blah" will search for packages whose name/description match the term given.

If you need more than that then I'd suggest a bit of searching - apt is a standard Debian tool, so there's oodles of documentation out there.