TaroWorks is now compatible with Salesforce Lightning. However, there are still two areas where you'd need to revert to Classic as we wait for Salesforce to continue to enable more functionality in lightning. Those areas are Libraries and User Management. To work with the TaroWorks Library for a View Resource Task or enable an Account as a Partner account for creating mobile users, you have to temporarily switch back to Salesforce Classic.
To do this, click Switch to Salesforce Classic.