Assuming you downloaded files to N800:

- Go to the directory where you downloaded the zip file
- run "unzip <downloaded_file>"
- Now look for file(s) with .prc extension. Under PalmOS, .prc files are executables and .pdb files are data.
- Start gvm. Click "Install". Browse to the directory where you unzipped the downloaded file. Select .prc or .pdb file (whichever one you want to install).

Hope this helps.