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A friend of mine have noticed that 7.4 is not installable using JDK 6, but it is what is said in the downloads page[1]. It should be updated asap. Regards [1] https://netbeans.org/downloads/
I think it is a P1 because it inducts the users to error. My friend installed the 7.3 with success using JDK 6 (which is the only one certified in his company).
The information was updated.