To install UDO onto an Atari or onto a computer with a compatible operating system (e.g. MagiCMac, MagiC-PC, GEMulator) just copy all files to a directory that should be named "UDO".
The GEM version should be the application for files with the suffix `*.u*' so you shall do the neccessary changes in your desktop (Gemini, Thing, Ease, Magxdesk, ...).
If you prefer the TTP version and you are using a command line shell (e.g. Mupfel by Stefan Eissing) copy or move `udo.ttp' to one of the directories that is part of $PATH (e.g. `\usr\bin').
The UDO Guide is actually in revision. Intermediate versions are currently only available on the UDO website for online-reading, but not for download.