It looks like all the RetroPie images moved under arcade punks.
The 3B+ is slightly different from the 3B so one of the images that said it would work for 3B didn't work for me.
So here's the steps to get it working...
Get the stock RetroPie Image from Raspberry Pi Imager. Note the new version doesn't let you drop in the wifi info on install which is kind of annoying and makes the initially ssh setup harder.
Install to the sd card.
Mount the sd card to your os. For me I'm doing it from Windows and WSL.
Install and run Ext2Fsd. This gives you an exe for Ext2 Volume Manager to be able to access the filesystem on the sd card. Assign a drive letter to the filesystem after the boot one for the sd card. If this gives you issues you may need to switch to regular sftp via ssh.
raspi-config > Localization > United States
raspi-config > Interfaces > Wifi
raspi-config > interfaces > SSH enable
Fire up FileZilla and connect via [email protected]
Now copy in the roms you want on there. If there are some in the img file that you want/need... you can get them by mounting them properly inside wsl.
WIP...