Known issueFixUpdated · 2 replies on Steam
Maplestory Classic issue after Maintenance (Workarounds)
Short answer
No confirmed fix yet. Players suggest: You didn't need to reinstall, it gives you that message when you haven't received the update through steam yet.
The problem
Anyone else get "Your game files are damaged and you will need to reinstall" or something along those lines? Im currently reinstalling was just wondering if anyone else seen this before
What players suggest
You didn't need to reinstall, it gives you that message when you haven't received the update through steam yet.
I got the message as well. Verifying integrity of files fixed it on this end, but surely a reinstall will do the same.
Did this work for you?
Source: original Steam Community discussion. Quotes are shortened; all credit goes to the posters.