How to solve "Failed to update Unity Web Player" error?

How did this happen?

I played unity games for about a year. Then I tried one game (don’t remember which) and this error appeared. So I did what was asked – re-installed web player manually. Now all games throw this error.

What I did to solve issue?

Browsers I tried:

1. Google Chrome 40.0.2214.93 (Official Build) m

2. Firefox 29.0.1

3. Internet Explorer 11.0.9600

Actions I have performed:

1. Cleaned all browser's chache

2. Reinstaled Web Player (WP) with antivirus program disabled

3. Reinstaled WP with administrator rights

4. Uninstalled WP. Restarted machine. Ran CCcleaner. Reinstalled WP

Nothing helped.

What I found so far?

All threads about this issue provide clear answers. There were some about disabling add-ons, but the fact that the issue appears in all 3 browsers negates that possibility.

Log files contents.

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log_xxxxxxxxxxxxxxxxx.txt
1150131 13:39:20 ------------------------------------------------------------
150131 13:39:20 Instance starting, version 4.6.2f1_bd99309c2ad7, UNITY_WEB_ENABLE_AUTODOWNLOAD: 1, GetDisableAutoUpdates(): 0 150131 13:39:20 Datafile http://chat.kongregate.com/gamez/0023/0582/live/Build.unity3d?kongregate_game_version=1422637487
150131 13:39:21 Setting error display: 'Failed to update Unity Web Player', details: 'A newer version of Unity Web Player is required, but the auto-update failed.
Failed to apply auto-update.
Please install manually.
', link: 1

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manager_xxxxxxxxxxxxxxx.txt:
150131 13:39:20 ------------------------------------------------------------
150131 13:39:20 Manager starting, version 4.6.2f1_bd99309c2ad7
150131 13:39:20 Requesting bundle 1 (3.x.x) update. Required revision range is 4618001 to 4618001, installed revision is ffffffff
150131 13:40:40 Requesting bundle 1 (3.x.x) update. Required revision range is 4378001 to 4558001, installed revision is ffffffff

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