Versão de JAVA

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Segundo a própria Oracle:

Citar:Can I keep JRE 7 as well as JRE 8 on my system?

Unless you have a support contract with Oracle or a license for Java SE Advanced products you will not be able to get security updates for JRE 7 from Oracle after April 2015 and it is not advisable to keep older versions of Java on your system. Nevertheless on Windows systems, if you would like to continue to have both versions, JRE 7 and JRE 8 can be installed on the same computer.  OS X users can also have multiple JRE versions available for desktop applications but only one of those versions can be used through the web browser.

Supondo que tens Windows, basta instalar paralelamente o Java 7 aqui.