Joompla 1.6 is about to be released, and probably you will add it to the list of applications.
I suggest you keep 1.5.21 available for download... it will make some of us developers our lives easier... please
Softaculous will have 1.6 stable whenever it is released.
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I agree, it would be great to have both 1.5 and 1.6 available to install. There will probably be some compatability issues with various components when 1.6 first comes out, so we may be using 1.5 for a while yet.