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I'm trying to install Java in order to use the Safari plugin. The "missing plugin" functionality redirects me to the Java download page, where I downloaded a file named jre-7u55-macosx-x64.dmg, which contains Java 7 Update 55.pkg.

Now, when I try to run the installer, I get the following error message:

Java 7 Update 55.pkg can't be installed because its digital signature is invalid.
The package may have been corrupted or tampered with. Get a new copy of the package and try again.

I'm not sure what to do here. I do need to install the plugin unfortunately. :-)

I'm running OS X 10.9.2 (up to date, as far as I can tell from the App Store) on a mid 2009 mbp, in case that makes any difference.

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    Download it again, I've had such thing an ISO was corrupt. After redownloading it worked. It might help you too. – Rob May 12 '14 at 6:22

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