I have installed the latest Splunk on my test machine (WINDOWS), and I want to install another instance having a much lower version of it. I know it sounds crazy but is it possible without uninstalling the 1st instance? I was always prompt at installing the lower version that I have already a newer version of Splunk installed. I have seen in the wiki page but it was on 2 same splunk versions installed.
The wiki page describes how you can install multiple versions on windows. (Note that it is annoying, as the MSI installer installs a service and doesn't give you much choice about it.) There's no reason you couldn't install different versions as your additional installations though.