With this release, we have just updated the version of the product 2.x to allow upgrading from 1.x version to 2.x without losing usergroup permission settings.
Simply upload the files form this package and you can find the add-on under upgradable XenForo 1.x add-ons. Running the update will enable the add-on and will keep usergroup permissions you had setup in XenForo 1.x
Feel free to report any issues you have and they will be addressed asap.
Please consider posting a review if you are using the add-on and let us and other users know how it works for you.