A universal method and system for downloading game software to legacy gaming machines. A gaming machine includes a locked enclosure; a first computing device disposed within the locked enclosure, the first computing device being programmed to enable game play of the gaming machine; a second computing device disposed within the locked enclosure of the gaming machine, the second computing device being configured for network access, and an interface between the first and the second computing devices. The second computing device is configured to receive game software components over the network that are compatible with (e.g., executable by) the first computing device but not compatible with (e.g., not executable by) the second computing device and to transfer the received game software components to the first computing device over the interface. The second computing device may include, for example, a PC. When the first computing device is a PC, it may be configured with dual-boot capability between two operating systems. When the first operating system is booted, game play may be enabled and when the second operating system is booted, game software components may be received over the network.