So I installed a clean --wpfc version. There was a nginx helper and w3tc plugin. I replaced this vanilla site with my original one using a neat plugin All-in-One WP Migration, I had no issues. It all took 5 minutes or less.
Now I have a configuration questions:
So when the plugin migrated my old site to ee site, I had all the plugins which were on my original site, meaning that I have no w3tc or nginx helper anymore, and I need to install and configure both. ( I made a w3tc settings backup which I will import)
Is it safe to migrate sites like that to EE, meaning will it alter EE configuration for that particular site?
I can only delete caching plugins from the migrated site and bring back nginx helper and w3tc and setup them again.