Need specifics about the errors/warnings. Are they about security? That may be because the sites are not using https, so modern browsers consider that a risk, but you can work around the warnings.
My experience has been that there is a lot of TTTE content out there in third party sites but that an awful lot of it is missing unfindable dependencies that the authors failed to include or indicate any source for. So it tends to ba a frustrating experience. Maybe someone can chime in with a source for TTTE that has actual complete assets.