Sounds like this (unsolved) thread: tor browser downloader install fail - #16 by entr0py
I have not experienced this issue myself.
You weren’t infected by the trojan because you downloaded manually - you were infected because you presumably didn’t verify the gpg signature. There is no material difference between using Tor Browser Downloader and doing it yourself manually (other than convenience).
Tor Browser: Manual Download
How can we help? | Tor Project | Support
EDIT: Maybe I misunderstood last quote. Are you concerned that present symptoms might be the result of a current trojan infection? Only way to be reasonably certain is to re-install verified images…