First on all, ensure that you have Microsoft(R) Word 2010 or later installed.
This downloads and installs Word+Equate. It registers Word+Equate as an add-in in your version of Microsoft Word. The installation program should ensure that all prerequisite Windows and Office components are also installed.
To register, open a document and use the License section of the Calculation ribbon menu.
Fill in your registration details and select next.
You will shortly receive an email at address given. It contains a Registration Key similar to the one below. Copy the key to the registration form and click register.
The Word+Equate document header will now display the days remaining for the trial.
Word+Equate needs Microsoft Office Tools to be installed prior to its installation. These tools should be automatically installed by the Word+Equate installation programs. If there are any problems, the link above allows manual installation.