https://blendermarket.com/products/rizomuv-bridge

• The RizomUV Bridge provides the user with an easy to use UI which makes transferring objects and UV maps between Blender and RizomUV as simple as clicking a button.Instruction: Install only one version, if you attempt to enable multiple versions at the same time, it will cause problems. If you have done this and cannot install: delete all versions of the RizomUV Bridge from your Blender addons, then install the latest version.