Trying to install Membership 2 but it is failing with a directory already exists

I have WPMU DEV Dashboard installed and BuddyPress ... I'm trying to install the Membership 2 plugin but it is failing with an existing directory.

Is this directory something that BuddyPress or WPMU DEV installed?

Could the directory be deleted and the Membership 2 plugin re-installed?

Basically I'm trying to create a custom registration page for my site and thought that the Membership 2 plugin would help me.

Any pointers would be great ...

Thanks ... Martin