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This is usually fixed by checking "Automatically detect settings" in IE (Internet Explorer) through the lan settings in the Internet option menu.
If an error appears (no permission), you will have to log in as root to change the parameter.
You will get an error at first though, complaining that something went wrong, which is due to the deleted files.
Download Steam CMD GUI and extract the ZIP file after finished downloading.2. Click on the Download Steam CMD button located in Tools.4.After it’s finished downloading Steam CMD, click on the folder icon located beside the Download Steam CMD button and extract file.5.Click on the Browser button for the Steam CMD path and select the folder where Steam CMD is extracted to.6.You may have to try multiple times until all the required files are downloaded, but once this is done, the files should update correctly next time.Work-around for this issue here: Just deleting the appmanifest files, without downloading replacements from a third party, may work as well!