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If you want to waste an afternoon experiencing the weirdness of pirate NES history, track down the 2021 repack. If you want to actually play Contra , just download the standalone ROM.
These ROMs use custom mappers (logic chips) to bank-switch between different parts of the storage. Emulating these often requires specific "unif" or "NES 2.0" headers to function correctly on modern emulators like The 2021 Context:
For the average player looking to enjoy NES games, you are much better off curating your own “Top 50” ROM set. You’ll save hard drive space, skip the glitches, and actually play games instead of fighting a broken menu.
: Contains approximately 1,000 classic NES/Famicom titles on a single unit. Hardware Compatibility