but if I have already manualy downloaded some tlz package on my hardrive is there a way to make it work?
To install a tlz package, go to the directory where the downloaded package is and su to root. Then type
(using the actual name of the package, of course). The package will now be installed. When you do this through installpkg, it's a good idea to do
at the command prompt before you type
to return to your user account. ldconfig makes the system aware of any libraries that were added by the package.
Now you should be able to start the program by typing its executable name at a prompt. Doing that at a terminal prompt the first time is a good idea because if there are any problems, missing dependencies, etc., you'll get error messages that will help you fix things.
The problem with using installpkg to install is that it doesn't check for dependencies and download and install dependencies that may be needed by the program. So it's best to use gslapt or slapt-get to find packages in our VL repositories because gslapt/slapt-get will get the dependencies for you if the package is made properly.