New user account is not created or notification email did not arrive? Remedies

Symptoms:

You installed MemberWing, ran test transaction but new user did not get created and/or notification email did not get delivered.
or:
Your new member paid but he did not receive notification email.

Tips, Hints and Remedies:

Are you using free version of MemberWing? Free version does not support automatic account creation. Only Webmaster and Professional versions support it.
Did you ran test transaction against already existing account?
or:
Did you ran test transaction against your own administrative account/email?
All test purchases must be done from account/email that does not yet exist in WordPress Users database. If account already exist – MemberWing will not send [...]

MemberWing User Guide

MemberWing
Multifunctional WordPress Membership Site plugin
User’s Guide

Installation and Configuration:

Download the latest version of MemberWing
Unzip and upload ‘member-wing‘ directory into ./wp-content/plugins So the resulted directory is: ./wp-content/plugins/member-wing
Activate it: goto dashboard, Plugins -> Member Wing -> Activate
Goto Settings tab->MemberWing Plugin – and note the “premium contents markers”: {+}, {++}, {+++}, {++++} Markers are the pieces of text that separate free teaser part of your article from the premium part of it.
Make a note of “Premium Content Warning [...]