Connecting to Voltar's Galactron . I have yellow mark
I try this but it doesn't work :/
1. clear the download cache
2. The files might have been broken by Steam while downloading. So the first thing to do when there are problems is always to let Steam check the files. To do so, right click the game in the Steam menu, choose Properties, go to the Local files tab and click Verify integrity of Steam cache. It is okay if the game says it needed to redownload 1 file. (Link to Steam's official walkthrough on how to Verify Integrity of Game Cache)
3. If that didn't work it might be because Steam's Verify Integrity didn't actually recognise the broken files and you need something more rigorous. Try what is explained in this topic to do a better version of that: viewtopic.php?f=13&t=30093
What Can I do ?