Mac OSX users: if you get a message (see below) "Unable to load Java Runtime Environment", this is caused where there is no, or an outdated version of Java on the computer. Wordshark/Numbershark need Java to run; please download the latest release from www.java.com ...then install it. You may then need to re-start your browser (close all browser windows and re-open.)
See related article: OS X Mojave 10.14 and Catalina 10.15If activation/deactivation fails: