Yes. Please make sure you get the correct major version release.. if you're using JFBConnect 2.x, get JFBCInvite 2.6.0; for 3.x get JFBCInvite 3.x.
Installation should be simple. You currently do have to uninstall it first before you re-install it. That will erase any configuration settings you've saved, so after re-installing it, you'll need to edit the module and re-configure it. In the future, we'll make it upgrade compatible, so you simply need to install it over the top of the current version.
We'd love to have your feedback on the changes. We thoroughly tested the 3.0 release and then made similar changes in the 2.6.0 version. While we tested it a bit, there may still be some issues as it uses a different (older) Facebook javascript library to function, which can cause some problems.