Office 365 Desktop Setup or Readiness Office 365 Desktop tool run-time error message "cannot start the application. Please contact the vendor of the application "

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Article ID: 2697990 - View products that this article applies to.

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Receive the following error message and you attempt to run Microsoft Office 365 ClickOnce application, such as Microsoft Office 365 Desktop Setup.
"Application cannot be started. Contact the application vendor. "
[Translations: cannot start the application. Contact the vendor of the application. >
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[Details (details)] will receive the following detailed error message.
Summary of errors
Following is a summary of the error, the details are displayed in the second half of the log.
* https: / /NameOfDomain> /ClickOnceConnector/Office365DesktopSetup.application activation is an exception, following failure messages were detected.
"Unable to install this application because an application with the same identity is already installed. To install this application, either modify the manifest version for this application or uninstall the preexisting application. " "For the same application is already installed, this application cannot be installed. To install this application, uninstall the application already exists, or to modify the version of the application manifest. >


You may have a problem into the ClickOnce application cache, and this problem occurs.


To fix the problem automatically "Automatic fix"Go to the section. If you do fix the problem yourself, seeRepair manual"Please see the section.

Automatic fix

Automatically fix problems if you click, click theFix itbutton or link. TheFile Downloaddialog box [Run], and thenFix it Wizard steps.

Windows 8

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assets fixit1
Fix this problem
Microsoft Fix it 20050
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assets fixit2

Windows 7, Windows Vista, Windows XP, Windows Server 2008 or Windows Server 2003

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assets fixit1
Fix this problem
Microsoft Fix it 50934
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assets fixit2

  • This wizard is displayed only in English, but automatic correction features correspond in all languages of Windows.
  • Running on the computer and save the Fix it solution flash drive or CD if you have not logged on to the computer problems, you encounter a problem after.
The following "To find out problems have been fixed"Go to the section.

Manual fix

To clear the ClickOnce application cache, perform the following steps.
  1. To resolve this issue, clear of the ClickOnce application cache. To do this, perform the following steps.
  2. Type the following command, and press Enter.
    Rundll32 dfshim CleanOnlineAppCache
To see a repair problem
  • Make sure that fix the problem?.
    • If the problem is corrected procedure is finished.
    • If the problem is not corrected, see Office 365 community Website "refer to, orSupportTo contact.
  • Please send us feedback. Problems with feedback and this solution " Fix it for me "Or post a comment in the blog E-mail Please send a message.

More information

For more information, please see the following Microsoft Web site.

ClickOnce unmanaged API reference
If you need additional information Office 365 community Please see the Web site.


Article ID: 2697990 - Last Review: October 13, 2014 - Revision: 21.0
Applies to
  • Microsoft Office 365
  • Microsoft Office 365 ProPlus
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Home Edition
  • Office 365 User and Domain Management
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