Uninstalling WPMUDEV Membership

After nearly 2 months, our programmers have finally determined that the WPMUDEV Membership Plugin does not work when the Authorize.net gateway is selected for a serial membership.

We need to change plugins so we can use our payment gateway but have been told it could crash our site as we also use BuddyPress. Is this true? How can we best chage without causing more issues, we’ve already been down for 2 months! Thank you