While updating to Community Components 2013. 12, following error occurred.

Community Components library
Install File: HtmlAgilityPack.dll
Failed: Access to the path 'C:\PROGRAM FILES\FIDELITY INVESTMENTS\WEALTH-LAB PRO 6\HtmlAgilityPack.dll' is denied.

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Community Components library
Install File: WealthLab.Components.Community.dll
Succeeded

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So is update of HtmlAgilityPack.dll important?

Also the following error occurred while trying to update to 2013.12.1:
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TASC Magazine Indicators
Install File: TASCIndicators.dll
Failed: Access to the path 'C:\PROGRAM FILES\FIDELITY INVESTMENTS\WEALTH-LAB PRO 6\TASCIndicators.dll' is denied.

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Obviously, TASCIndicators.dll was not updated.

Solution: TASC Magazine Indicators error updating

Perhaps I'll have to add this on our Open Issues list.

UPDATE: Done.