You cannot play Super Smash Bros. 64 natively on PC—there's no official port. However, emulation offers workarounds:
Emulation Options
Project64 / Mupen64Plus: Popular N64 emulators for PC.
Legal note: You must own the original cartridge. Downloading ROMs you don't own is illegal in many regions.
Multiplayer Approaches
Netplay (online): Some emulators support online multiplayer. Requires stable internet and configuration knowledge. Both players need the same emulator/ROM.
Local split-screen (single PC): Limited support. Research emulator-specific guides.
Two PCs (LAN/online): Each runs emulator; connect via netplay. More technically demanding.
Better Alternatives for PC Multiplayer Smash
Super Smash Bros. Melee (via Slippi/Dolphin): Superior netplay, active community, easier local/online setup.
Super Smash Bros. Ultimate (Switch): Official modern entry with robust local/online multiplayer.
Emulation setup is complex. Expect troubleshooting and research.