I have completed the WP-Members 2.2 upgrade and released it via WordPress SVN. You can download a copy of it from http://wordpress.org/extend/plugins/wp-members/.
Alternatively, you can get it directly from the WP admin panel by selecting “Add New” from the plugin menu and entering the search term WP-Members.
If you are an existing user of the plugin, you can upgrade via the admin panel as well. However, if you have done any customization to the code of the plugin, you should probably test the upgrade in a testing environment (actually, this is a good habit to be in for any plugin). If your customizations revolve around changing which registration fields are required or whether posts are blocked/unblocked by default, you should have no problem with the upgrade – you’ll just need to make sure that you have updated your settings appropriately.
As discussed here, this version better enables users to customize their installation and use of the WP-Members plugin.