The site was down temporarily for maintenance, your issue should be fixed now.
If you're still having issues, it's more than likely that a plugin you have downloaded from BSMC has been removed from BSMC or the publisher was banned.
Check your history and downloaded file history for the terms 'CRACKED'. Each plugin from BSMC has cracked on the end of the file name, to help you locate what you've downloaded. Then disable/remove each plugin one by one until you find the culprit.