When a new version is out, Halos shows "Download update" in its panel. Click it, close After Effects, and the update installs. Your settings, saved expressions, library and licence stay as they are.
Or open Window > Extensions > Halos > Settings and click Check now.
The download happens inside After Effects. There's nothing to find or unzip.
On Windows the update installs as soon as After Effects closes. On Mac the installer opens; click through it.