You are getting 'false positives' - the recommendation for installing ANY new app is to stop ALL running programs. Despite what some people thimk, this INCLUDES turning off the A/V dusing an instal (it will have been checked during the download).
It's possible that the bundled app (it changes from version to version) is what triggers the A/V. I can assure you that there is no virus or trojan in BC - The 'warnings' are another matter entirely. It's possible that you have something on your computer that is causing that, but without the actual details (or seeing it myself) I can't help there. All ( can say is that it doesn't occur with Adaware A/v, nor with Defender on my computer)