NIS Disappeared from Remote Computer and Needs to be Reinstalled

I have two subscriptions to NIS, for a total of three installs.  Yesterday, I visited one of my remote sites, and noticed that NIS is no longer found on one of my computers!  I have no idea how it got removed, but I need to reinstall it.  I know how to get to my account and download the installer and reinstall, but that computer is on a dialup line, and it takes forever.  Is there any other way to reinstall on that computer, without having to download the installer?  I tried that yesterday, and it took nearly a half hour just to download the installer.  Then it required me to reboot before installing, and the computer would not boot, and had to return to a previous good restore point, thus loosing the installer.  Do I have any other options?  Thanks for any help.  I need go to that remote site again tomorrow and try to get NIS up and working.  Suz