Failed to install JDK 7

I don’t know whether to ask the question correctly if I don’t say that I will transfer my question elsewhere.

I am using OSX (Maverick) and I am trying to install JDK 7 to use javaFX. So I downloaded the package .dmgfrom oracle, and when I double-click on the package, I get an error message can't found mountable file systems. I found this warning in the documentation:

If you download Java 7, you will not be able to run Java content in Chrome on Mac OS X and will need to use a 64-bit browser (such as Safari or Firefox) to run Java content within a browser. Additionally, installing Java 7 will disable the ability to use Apple Java 6 on your system.

So how can I install JDK 7 correctly? and is it dangerous to install it? Could this ruin all my settings, knowing that I only want to use JDK 7 to run a java project?

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2 answers

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Java 6 & 7, : https://superuser.com/questions/490425/how-do-i-switch-between-java-7-and-java-6-on-os-x-10-8-2

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