Genius was originally different, but evolved to have a meaning that is similar to ingenious. And one of the early. In the apps & features screen, scroll to the autodesk genuine service entry and click it to expand it.
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It is perfectly correct and grammatical.
Indeed, ingeniōsus appears to be the same root that gave us the word engine.
Genius as a concept (of brilliance, inventiveness, etc.) predates genius as a person (one gifted with genius). If you use the word to mean an intelligent person then the plural can. My answer always included the qualification that genii is limited to a particular meaning of genius. Click uninstall, then follow the prompts to uninstall the autodesk genuine service.