Portable Apps Platform doesn't seem to be detecting that a new version of Chrome is available on portableapps.com. My installed version is 80 but the latest version is 81. I tried running a manual update through Apps > Check for Updates but it doesn't show the new version either.
Platform version is 16.1.1 and Chrome was installed through the platform into the default directory.
Chrome Portable ... latest version is 81.
https://portableapps.com/apps/internet/google_chrome_portable