I can recommend installing the Zibo version. It is totally free, is extremely capable, ie better than the Laminar version by far.... You just need to install version 36full and then the latest cumulative update (none at present). It's standalone so installs as a seperate aircraft, leaving the stock one in place... Just drop the B737-800X folder into XPlane11/Aircraft directory.
I can't post the url here, but a search of the Org should put you to his Google Drive. You have to make a copy to your drive (right-click - make a copy) and download from there.
YouTube channel flightdeck2sim is a 738 pilot who is testing the mod. These videos show how good the "free" aircraft is.