Eric Gentry writes:
This small new release fixes a Blender 2.9 compatibility issue with the addon. Install it to ensure that the addon works with the latest version of Blender!
For the unfamiliar: Mesh Align Plus helps you align, move, measure and match things precisely in your 3D scenes. It's designed to provide precision modeling capabilities, especially for hard surface modelers, mechanical, architectural and CAD/CAM users. Check the links below for more info: