The Contra Anniversary Collection is now available on the Nintendo eShop for the Nintendo Switch. You can download the game directly from the eShop or grab the NSP ( Nintendo Submission Package) file from the official Nintendo website.
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Installing an update for a game you do not legitimately own is illegal. If you own the physical cartridge, dumping your own update via NXDumpTool is the only legal method. The Contra Anniversary Collection is now available on