Version 2.1.0 without a previous version already installed, does not install. The installation takes a very long time, and step 3 never finishes (tried several times, even leaving the computer running for an hour).
It is nevertheless listed in the installed plugins, but wordpress declares a fatal error when you want to activate it.
I managed to install this plugin by finding version 1.2, which installs perfectly, then by doing the update, which also works well.
But the direct installation of 2.1.0 needs to be reviewed.