Game loader files are always single zipfiles for a given game. And the usb flash drive they're on must be FAT32 formatted for a fam14 machine to be able to read it.
If you boot your machine and it is running normally. THEN open it up and in the secure USB ports behind the metal door on the brainbox, make sure the cage switch is open (usually a wad of paper is jammed in it to close the switch, remove the wad of paper to open the cage switch), then plug in your ekey and the flash drive with game loaders.
In the ekey menu just go to setup>game>manage packages. And any valid game loaders it finds on a connected flash drive they will be displayed in the left column that you can install. (if you click next, it displays installed games where you have the option to remove any installed games if you wish, but don't do that, remain on the install page). To install them you just move them to the right side column and then tap "add" to install them and they are copied to your machine. When it says they are completed. You likely have no "back" button and it says to exit. Where it dumps you out and tells you to remove the ekey.
So just unplug the usb flash drive and your ekey, then just plug the ekey back in. Now in the ekey menu you can go to setup>game>enable/disable games, and they will now be listed there so you can set the paytables and enable them.
Pretty simple, if no games display on the add page, there should be a rescan button to rescan for loaders on an attached flash drive. Or you can also unplug the usb flash drive and plug it back it and it should rescan the usb flash drive for installable games. But if nothing populates when you're on the add packages page. It didn't find any valid game loader files on the usb flash drive.