Hello. I am posting this based on the fact that I have problems getting online to the PTR.
Issue: Downloading the PTR client for 4.2.0 (I hope), I have downloaded the previous for 4.0 some time ago when I wanted to try out that. So now, when the download is complete I get the message "The installer does not need to be applied. It requires a version of "Wow.exe" older than 4.0.012635, but you already have version 4.0.3.13329."