Nestopia might be a bit more popular than Mupen64Plus. We know about 1 link to it since March 2021 and only 1 link to Mupen64Plus. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
M64P is an easy packaging of Mupen64Plus that comes with a GUI frontend, configured plugins, etc. Mupen64Plus is the emulator itself. Source: almost 2 years ago
Try to remove the emulator in Configure emulators,and import it again, it could work. You can also try different emulators like Nestopia or FCEUX (the one I am personally using). Source: about 2 years ago
Project64 - Project64 is a Nintendo 64 emulator for the Windows platform.
Mesen - Mesen is a NES/Famicom emulator and NSF player.
1964 - 1964 is a Nintendo 64 emulator for Microsoft Windows, written in C and released as free software.
FCEUX - FCEUX is a Nintendo Entertainment System (NES), Famicom, and Famicom Disk System (FDS) emulator.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
puNES - PuNES is a high accuracy NES emulator.