1a) Download the TKP zip file from this site. Download this zip file by clicking the 'Download ZIP' button on the middle right side of this page (or use the link directly below this line). Wait for the download to complete.
1d) Unzip the downloaded file (by right clicking it) and then click on 'extract all'(Win) or 'unzip'(Mac) to unzip it.
1e) Open the unzipped TKP folders and find the 'TKP_Launcher.jar' file.
1f) Run the 'TKP_Launcher.jar file by double-clicking it. Wait for it to run.
If the jar file runs ok, then Eclipse will launch with the TKP workspace open.
You may have to click update to latests Eclipse project settings.