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I can only find system requirements for EndNote X4, but I only have access to a copy of X3.0.1. (I've now found the specification for EndNote X3, and it says Windows Vista or Windows XP, but most Windows XP stuff runs fine on Windows 7?)

I had EndNote X3 on Windows Vista, and then my C drive died. When I replaced it, I got 64-bit Windows 7. Now I can't re-install EndNote. When I try to install it, it keeps saying:

This installation package could not be opened. Contact the application vendor to verify that this is a valid Windows installer package.

It may have been installed on the E drive, so could some of the left-over files be causing trouble? I wouldn't think they'd stop the install package opening at all though? (I tried gathering all the loose files from it together in one folder. It hasn't seemed to help so far.)

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Yes, it seems it is. I have it working now.

I solved either by cleaning up all the files from the old installation which were floating around, or possibly by downloading it in Internet Explorer instead of Google Chrome.

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