As it says in the name, "behaveslike" means it is suspicious because it looks like know viruses, but it is most likely a false alarm.
In the same way, the second one having "packer" in its name I'd guess it is also a false alarm due to the compression used for the installer or the executable itself.
It is up to you, but this program is well know and all the other results of the page mark it safe (only 2 out of 54 gave a bad result).
But I don't want to force you to trust me over your antivirus, both me and it can be wrong (which one is it btw?)