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The most possible reason is that you have no sufficient privilege to write some files during update. Do you logon with administrator role? Please check you have write privilege to following folders: C:\Users\<UserName>\AppData\Roaming\Adobe\Dreamweaver CS5\en_US\Configuration\Extensions,
C:\Users\<UserName>\AppData\Roaming\Adobe\Extension Manager CS5\Configuration\Extensions,
C:\Users\Public\Roaming\Adobe\Dreamweaver CS5\en_US\Configuration\Extensions. You can run Extension Manager by right clicking icon and select "Run as Administrator" to avoid most privilege-related problems.
Thanks for your suggestion. I do have administrative privledges, but even so - I tried running it as administrator, but the same problem came up. :-(
Any other ideas?
Never mind. After doing a reboot (for a different reason altogether) and starting up Dreamweaver, it now asked me to install the html5 extension update, and it did so successfully. So looks like everything is fine now.
Hi - realize this is a few months old but I'm having same issue.
1. Each CS product which Extension Manager supports has a file named XManConfig.xml. If Extension Manager can not find this file from a CS product, Extension Manager will not integrate this product. So in order to determine the cause, you can rename XManConfig.xml for all CS products temporarily (You can find this file under installation directory or its configuration sub-directory of each CS product), as a result, Extension Manager will not integrate any product.
2. Try to launch Extension Manager, if it can be launched successfully, then you can rename XManConfig.xml back one by one and launch Extension Manager again after each rename. If Extension Manager can not launched after you rename XManConfig.xml back for a certain product, then the problem is relevant to this product, you can generate log files to assist troubleshooting. You can read other threads in this forum to learn how to generate log files. Of course, if you don't need Extension Manager to manage extensions for a specific product, you don't need restore name of XManConfig.xml for that product.