This guide may help
I softmod the Wii and downloaded a few homebrew games to test from Wiibrew website. Some work fine but some give "Invalid Application" error after loading.
Half of what I downloaded (so far) don't work: Freecell, Solidaire, etc...
What caused this error and how to fix it?
Be sure they are boot.dol and not boot.elf. It may be simplier to install homebrew browser and then download all of the wiibrew app from there.
Ipsa scientia potestas est.
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It doesn't work for me neither. In the folder of an app I downloaded, there's BOTH a boot.dol and a boot.elf file. I put them both. Is this why the HBC tells me the app is invalid ??