Affiliates plugin not showing Membership add-on

Tried to enable Affiliates Plugin for use with my Membership Premium site.Installed via WPMUDEV dashboard but did not see any Add-Ons listed in the "Add-ons" options. Uninstalled and deleted and downloaded the plugin and installed via WordPress. Same thing. It does not recognise my Membership plugin and doesn't offer me the add-on to enable.

Jack K. has Admin access to my WordPress Dashboard as I'm having other problems as well with Membership plugin.

Can you look at this too please?

I will post another question after this as I'm having problems with the My Account and signup forms as well after updating Membership plugin.

Thanks,
Louise