There is a test install of Archivists' Toolkit on this server. To use it, download and install a current version of a client from the link below (available for Windows, Mac and Linux). You may not have permission to install the program in the default place on your office Windows computer (C:\Program Files) but you should be able to create a directory like C:\local and install it in there.
As it turns out, you do not need to install your own server to test its functionality; you can connect to the sandbox using the parameters described on the support page. There is a lot of data already entered there, and you may enter your own as well. You may also check out the reports it can create.
If you'd really like to look at a mostly blank repository to put test data in, ask Kathryn for the passwords to this one.