they say you shud uninstall AV and firewall, DO NOT EVER DO THAT, its not what the problem is, i use this trainer and i got AV and firewall running and the trainer work fine, you may have some other crap on your pc that prevent you from downloading this trainer
Just because your AV doesn't have a problem with downloading the trainers or using them doesn't mean other peoples wont.
AVs with realtime scanning or those that monitor browser activity can interfere with websites/downloading if they consider them to be a threat.
Disabling such options should help, if it doesn't then said persons AV probably sucks and they should get a different one.