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Manual: How to set up IE Mode (Internet Explorer Integration) in Edge C (Updated)
Update (08/2020): Some things changed since I firstly wrote this, so here is the revamped version. For more detailed info, view Microsoft's article About IE mode So, since it took me almost a day...
The only missed step would be a system restart/reboot after all the Registry changes are completed. At least that was what I needed to do before Edgeium took the changes.
Here is the Microsoft URL documenting the steps using https://docs.microsoft.com/en-us/deployedge/edge-ie-mode