Agreed, that's a common culprit. Also, try temporarily disconnecting any non-essential USB devices like printers or external drives during the install.
Can confirm. This happened to me. For me, it was a specific audio driver that was compatible with 10 but kept blocking the 11 install, even though it was "updated."
Yeah, that's a solid suggestion. Also, try temporarily disconnecting any non-essential USB devices before starting the install—sometimes they can interfere. Let me know if that works.