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Cannot install Flash-Player Plugin. Manuell installation downloads an .xpi file which ist not executable

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Cannot Install Flash-Player Plug-in. When I download Flash-Player under Firefox 3.6.10 and Windows 7 I am asked to install a missing Plug-in. Trying to install it I get the message the plug-in cannot be found. When I try to install it manually it downloads an .xpi file which is not executable

Cannot Install Flash-Player Plug-in. When I download Flash-Player under Firefox 3.6.10 and Windows 7 I am asked to install a missing Plug-in. Trying to install it I get the message the plug-in cannot be found. When I try to install it manually it downloads an .xpi file which is not executable

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You have Shockwave Flash 10.1 r82 installed already.

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Yes it is installed