Uninstall v6 and install v5.2

Uninstall v6 and install v5.2

  
Hi all.

after installing for test your new version of the platform I tried to uninstall it to  continue my work in the 5.2 platform but now I can't install it becaus I keep getting the answer that the latest is already installed.

I can I resolve this ?

Regards.
Frederico Monteiro