If you have not already done so, install Opus and UrbanSim, along with any needed supporting software. Directions for the current version of the code are at http://www.urbansim.org/docs/installation/. If you are using a (perhaps older) stable release rather than the current version fresh out of the subversion repository, the table of releases at http://www.urbansim.org/download/ includes a link to the installation instructions corresponding to that particular version.
Next, download the Eugene 1980 baseyear cache zip file by following the appropriate link on the download page http://www.urbansim.org/download/. If you are using the source code for a stable release, there will be a link to the Eugene 1980 baseyear cache file that works with this version in the table of stable release versions. Alternatively, if you are getting the latest version of the code from the subversion repository, there is a link in the ``Current Source Code'' section. (We frequently update the Opus and UrbanSim source code, but the sample database doesn't change very often -- so the stable release version and latest version will likely be the same.)
Unzip the file into a cache
directory of your choice, such as c:\urbansim_cache on Windows, or
/Users/yourname/urbansim_cache on the Mac. This example
Eugene-Springfield database contains all of the data that UrbanSim needs to
run a simulation of Eugene starting for simulated year 1980.