Wii U USB Helper - provide ISO (injection)

Please, can anyone help? I was going trough this tutorial: but it looks like somewhere is a mistake because it won't allow me to download the games.

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Injector Tool · Issue #32 · FailedShack/USBHelperLauncher · GitHub

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Injector Tool · Issue #32 · FailedShack/USBHelperLauncher · GitHub

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Injector Tool · Issue #32 · FailedShack/USBHelperLauncher · GitHub