Picade Raspberry Pi 4 support.... Where?

Hi,

Got the picade cabinet kit with the 10inch upgraded + the usbc rpi4 supported version. Hardware was somewhat easy but the software part is misleading as the errata shows no support to the pi4 as the retropie seems not being ready for it.

I’ve read posts about people installing the retropie on pi4 but I’m getting lost on how or when is the hat detected or configured…

Is there any step by step guide, official or unofficial (that IMHO should have been included in the product in first place) to finalize the build in a noobs way?