You need to add those applications to the Exclusion list, when you believe they're safe for your computer, but there is also the possibility that the applications you're trying to install are infected with adware or malware and because of that the antivirus blocks them.
I recommend downloading an application from the developer's website and then try to install it. If the antivirus will detect it as malware, then I recommend changing the antivirus because it's bad and it's not working properly with files. Try something from Avast, Bitfender, AVG, or ESET. The false detection rate is way lower therefore making sure you can install your apps.