Last year I installed the old Membership plugin, and later canceled my subscription to WPMU. I've continued using the plugin but it isn't working quite right anymore (i.e. it isn't removing members from one access level when they stop paying), so I've decided to go ahead and upgrade.
I've reactivated my subscription to WPMU and tried to download the new plugin, but it won't install because the original one occupies the destination folder.
I found a help forum post saying I need to upgrade the original plugin first to a newer version, but it won't give me the option because it doesn't seem to log in the dashboard that I have the original plugin.
Hence I'm coming to you. I've granted support access to the site but please let me know if you need anything more from me.