clarkwinkelmann alx please post the error message. It can be found in Flarum logs at <flarum>/storage/logs or seen on screen by enabling debug mode in config.php and trying again.
[deleted] I get this all the time. Never seems to work from the extensions screen, but works fine via composer / SSH
matteocontrini It's broken in beta8: https://discuss.flarum.org/d/20197-after-installing-reflar-polls-extension-from-bazaar-got-virus-alert-from-server/12