If you are using a 3rd party antivirus, even if "it worked before" after an update the scanner may think its a different file even if you allowed it once... It has been said many, many times issues regarding 3rd party anti-virus's, and even in the launcher itself.
Also the old launcher is not going to be updated, so please use Minionapp.
Also the old launcher is not going to be updated, so please use Minionapp.