Can't uninstall

I am trying to install the Windows version of 4.3.5 but it says it needs the msi for to complete the installation. Apparently it is trying to uninstall as I find I cannot manually uninstall I’ve downloaded LibreOffice_4.3.2.2_Win_x86.msi but apparently that is not enough for the uninstall to proceed.

In Windows you don’t need to uninstall when you want to upgrade.----

To help you, please inform in details on the steps you did and what was the result of each step. Additionally also inform on your OS

For first, making every single post of yours a wiki is completely pointless.

For second, installing in place of 4.3.5 should be pointless.

Addendum to second: install 4.4.0 RC 1: