Charles,
I’m not sure what you are asking, but all our previous releases are available from our Download page. You are certainly free to run through them and see which versions work with LaszloIDE.
MyEclipe 5.5 was our last stable release and is based on Eclipse 3.2.2 and WTP 1.5.4, so that might be a good place to start.
NOTE: I would suggest starting with the MyEclipse 5.5.1 All in One installer. That will install a JRE, Eclipse SDK, WTP 1.5.4, and MyEclipse 5.5.1 all together for you. Then you can add LaszloIDE and see if that works.