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I just installed a brand new copy of QGIS 1.8 Lisboa and all of the associated software on a Windows Vista PC using the Windows Osgeo4W QGIS installer, and I get this message:

"The Plugin Installer has detected an obsolete plugin which masks a newer version shipped with this QGIS version. This is likely due to files associated with a previous installation of QGIS. Please use the Plugin Installer to remove that older plugin in order to unmask the newer version shipped with this copy of QGIS."

I did have an older copy of QGIS but I uninstalled it and I am 99% certain that I successfully deleted all of the associated files and directories. I notice that the Osgeo4W directories created by the OSGEO4W installer include several versions of QGIS (including 1.0 and 1.4), but I am a novice user and don't know how to figure out which plugin is causing trouble, or if this could be a bug in the Osgeo4w installer.

Thanks!

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I think the error window title used to contain some information on the plugin causing such trouble. Have you checked? – underdark♦ Jan 12 at 11:39

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You have to remove the .qgis folder in your user path. Thats where the plugins are stored.

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Well that is if you want to remove everything but a bit brute force to remove everything if it's just one plugin. Also if you do this only delete the \python\plugins folder – Nathan W Jan 12 at 6:43
Thank you both -- is there any way to tell which plugin is obsolete? – John Jan 12 at 6:56
Does Plugins -> Fetch Python Plugins... show a list that tells you what is installed? Does anything have status "invalid"? – BradHards Jan 12 at 7:14
Thanks BradHards, and apologies for the delayed response -- was away for a couple of days. I just tried that and there is a plugin called "Plugin Installer" that is upgradeable from 1.0.1.0->1.1, but when I try to upgrade I get the message "Failed to unzip the plugin package. Probably it's broken or missing from the repository." – John Jan 16 at 4:20

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