When you go to create a new project for the first time after install, this function (GetPlatformsForUnityVersion) is never called by default if you already have an editor installed. This causes an exception because the combobox is empty.
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When you go to create a new project for the first time after install, this function (GetPlatformsForUnityVersion) is never called by default if you already have an editor installed. This causes an exception because the combobox is empty.