* Go to the astrometrica website downloads page here. Then click on the full install version with the following description...
Version 4.5.1.377 Installation Package (EXE file, 5900 kB) (Full version with tutorials and default settings. Includes a wizard that guides you trough the installation process. Installation only - no updates of previous versions possible!)
This will ask you to store the setup.exe file, so decide where you want to store the file on your computer, and then run setup.exe. At the end, you will have astrometrica installed on your computer. I suggest you take the defaults and let it install at c:\Program Files\astrometrica.
* Go to the IASC site here, and click on the link to the configurations files. This is a compressed (.zip) file which you unzip to the folder which contains the astrometrica program. Windows has its own unzip utility which should automatically kick in here if your computer is properly configured. If you don't have an unzip utility, they're really handy to have. CamUnZip is a free program which I use on my own computers. Probably c:\Program Files\Astrometrica is the name of the folder you will want to unzip into. The configuration files should be ARI-24.cfg and ARI-32.cfg. These are files which contain information about the 24" and 32" telescopes which IASC uses to obtain the images. We'll be using the images from the 24" telescope, so you'll need to load that configuration file into astrometrica. To do that,
* Start up Astrometrica (click on the blue astrometrica icon on your desktop).
* Click files | settings | observing site, and at the bottom of the box click on open and you'll see the contents of the astrometrica folder. You should see two rainbow icons labelled ARI-24.cfg and ARI-32.cfg. Double click on ARI-24.cfg and then open and save. Now you should see the observing site and the other tabs too with new info in the fields. You should see ARI-24.cfg in a little box in the lower right corner of Astrometrica. If you see something else (like maybe "astrometrica.cfg"), then you did something wrong.
Congratulations! You've now successfully installed Astrometrica on your home computer!