thank you for contact us.
We answer you step by step:
1- You have to disable or remove the free plugin
2- Probably fatal error don’t let you activate the plugin, try to do step 1
3- You only have to go on “Settings->Permalink” and click on “Save Changes”
If you have any questions please feel free to contact us.
You pay 1 year membership and so you have access to this premium support.