Welcome to the Collaba Software Download Center. Collaba is distributed as a single zipped (.zip) package. Everything you need is in that file: server software, documentation, databases, etc. The package is multi-platform and is the same no matter which operating system you use (Linux, MacOS X, Windows, etc.). As soon as you extract the contents of the installation package on the computer you selected to host the Collaba server application, you will find a Documentation directory which contains the Collaba Administration Guide (.pdf). From that point, read and follow the installation or upgrade instructions therein.