According to the linked bug it is due to an issue to the DivX installer messing with the users chrome install. I don't know if the DivX installer on other platform experiences this issue but it sounds likely that it is only the Mac installer that has this issue.
If you're using packages on Linux, the package manager is responsible for uninstalling the old version. For example, yum/dnf on Fedora/Redhat will only keep one version of a package during 'yum update' (with the exception of the kernel, where the most recent 3 versions as well as the running kernel are kept to avoid breaking boot).