Some anti-viruses can give a false positive and falsely identify Bet Angel as malicious. Sometimes, the software will quarantine the file and this will make it impossible to install.
Try the following:
- adjust your antivirus settings and allow Bet Angel as a trusted file
- locate the quarantined file within the antivirus software and release it
- Re-download and watch for any options given by your antivirus software
- refer to the documentation or website for your antivirus software for further options