Potential challenges in writing this paper could be finding accurate information about the PC version's release date in 2013. If there's no official release, the user might be referring to a fan-made port or a mod. Need to verify that. Another challenge is handling the aspect of downloading it for free ethically. The paper should encourage legal downloads even if the user is seeking free options, maybe mention if it's out of copyright or available on platforms like GOG or Steam with free promotions.