Tested with 17.8.2318 on multiple PCs running Windows 10 version 1709.
Looks like it is something that is botched in the installer downloaded through a recommendation link.
Installations with the regular installer does not show this problem.
Thank you bob3160 but I already fixed the problem by installing Avast normally (not through the recommendation link).
I was just hoping that this info could be forwarded to the right people (developers) as I did not see it mentioned anywhere when I searched. ;D