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Retroarch & retroarch plus aren’t working for me.
Use libretro website apk
i'm having this problem as well. I assume somethings been moved in regards to the configs or cores but without root access I can't do much about it.
Arc Browser is also having the same issue.
According to the Retroarch website, they made changes to the core system in order to be compliant with Google polices. This could be what is causing the problem. If you want to get the latest version of Retroarch with the proper cores you can get it on their website here:
Scroll down and look for Android and you can download the lastest apk here. Don't download the apks labeled Google play. These are the same ones that are posted in the playstore. Use 32-bit apk or 64-bit apk. These should contain the correct cores.
Hope this helps