Lets see, for a port of a game that was released in 1987- I find it atrocious that the minimum system requirements are windows 7, 1.8ghz processor, 1gb storage and 2gb ram. By all rights this game should be playable on windows 95 machine at 1/3 the specs listed. The graphics might be polished a little but even with that and a better framerate- the posted min sys req are way overkill.
$4 for the user manual and the soundtrack... thats it?! no exclusive in game weapons or special moves or skins or extra levels or anything. You shouldnt have to pay for the manual which is basically, how to play the game which nowadays is taught in a tutorial anyways. You could probly find the manual for free somewhere anyway. And whats worse- its DIGITAL so it cost nothing to make. As for the soundtrack- also digital, and you already get a copy of the soundtrack in the game so... youre basically buying the soundtrack twice. Not only could you rip it from youtube- but every game ever has the music files in the installation folder, you just gotta know where to look. In conclusion, save your money and dont buy the "upgrade"