You'll find here eShop games version only, at only condition there is an existing ticket for it. To download file, have more details concerning WiiU USB Helper and support his developer, please go to WiiU USB Helper Official Thread.
Here I'll show you WiiU USB Helper's installation and configuration to the point you'll be able to download games on your computer. After that you'll need to transfer downloaded games to your SD card. WiiU USB Helper can handle this, transferring data to SD card is quite simple, just plug it on your computer and just indicate it to WiiU USB Helper. Then install them to WiiU using WUPInstaller.
Now that you downloaded WiiU USB Helper, it's time to install it, just launch update.exe (of course, accept connections if you are using some firewall). First thing it will ask you is to indicate an installation folder, then updater will do his work :
Now WiiU USB Helper will launch and ask you to select region of your console, also there is a disclaimer, so don't forget to check "I agree to these terms" and click on your region. Note that this is really important if you are using a hack that doesn't allow Region Free ! Installing a game from another region could brick your WiiU in that case ! By the way, you can change Region whenever you want later on WiiU USB Helper.
Here is one of the most important part of WiiU USB Helper's configuration. You need to indicate websites for ticket that are absolutely necessaries for every game. You can enter an address concerning WiiU tickets and another one concerning 3DS tickets (cause if you have a hacked 3DS you can also grab content using WiiU USB Helper). Addresses can easily be found on the net, anyway...
Once that is done, you'll have to indicate folder where you want to store games :
Here I encounter an issue cause application is trying to open something that seems to be an ads using an invalid address. That result on a white window that you simply have to close :
Everything should be ok by now, and you're now on WiiU USB Helper interface, showing you all content for region you choose and for tickets you indicate. For a clear navigation, you can go to "Filters" tab :
Back on "Library" tab, you just have to select content you want and click on Get It button, if there's an update for this content, application will automatically suggest you to add it to download list, same thing concerning downloadable content. You will on left part your download list where content you choose will be added. Simply launch download by clicking on "Download game(s)" icon ! You can see progress by clicking on "Download Manager" located at upper right part of interface.