Hi! Welcome to the forum!
I believe that to install Calibre 2006, you have an executable file. So all you do is execute the executable file, for example, type:
Then you follow the instructions, enter in the directory, etc.
Afterwards, in your .cshrc file you set $MGC_HOME environement variable to where you just installed it.
Then, you set $path to include $MGC_HOME/bin
Hope that helps. Have a nice day!
It's really easy to install as Karen explained. However, make sure you have the correct build for your platform. You can find this on supportnet under system requirements. Then, before you execute, make sure that you've changed the permissions, for example :
chmod +x calibre2006.3.exe