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cant play killing floor 2 crash

That steam support link should take you to some information. Here's some to try:
[h=1]Game constantly re-downloads and re-validates[/h]
Sometimes a game on Steam will non-stop update and validate itself, and when trying to launch it, it will update and fail with reason "Corrupt update files" or something similar.

This can be caused by your anti virus or similar software deleting the update files before steam has a chance of copying them to their intended location to update a game.

Try temporarily disabling your anti-virus (or similar) software and see if the problem is resolved. Check your anti virus (or similar) software logs to see if they did in fact interfere with Steam or your games.

The solution to this problem is to do a full reinstall of the game:
  1. Right click on the game in Steam Library and select Delete Local Content...
  2. Once the game has finishing uninstalling, install it again.
  3. Please keep in mind, that reinstalling a game will remove all user content, so backing up your content is highly recommended.
[h=1]Disk Read or Write Error or Content File Locked[/h]
If when installing or updating a game on Steam displays one of these messages:
  • "An error occurred while updating [game title] (disk write/read error)"
  • "An error occurred while installing [game title] (disk write/read error)"
  • "An error occurred while updating [game title] (content file locked)"
Causes:
  • A file Steam needs to access is locked and cannot be opened or edited. This usually happens when the game in question is currently running, or any of its files are opened on another program.
  • File is opened for scanning or quarantined by your Anti Virus software by real time filesystem scanning. This is also known as a false positive.
Possible solutions:
  • Close the game that fails to update with the error
  • Usually restarting Steam or your PC helps too.
  • Exclude game's or Steam's folders from your antivirus scans.
  • Temporarily shutdown your antivirus completely.
Here's also an official Steam Support article about this issue:
https://support.steampowered.com/kb_article.php?ref=9709-FKCB-4230
 
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