To install Auto Tax Calculator solution from the Microsoft AppSource, visit the link and follow the steps shown below:
Click on the 'FREE TRIAL' button.
If the user is already logged into CRM, accept the terms & conditions and click on 'Continue'. If the user is not logged into CRM, fill in the credentials and Sign in.
Next, confirm the details in the form, accept the terms & conditions and click on 'Continue'.
Select an environment from the dropdown list given and then accept the privacy policies & legal terms. Proceed to the installation by clicking on the Install button.
After the installation is done, you will be able to see Auto Tax Calculator solution in your Apps section.