I had a problem installing Aptana 3.6.1 on my windows machine. It always shows "fail to locate node.js installer missing windows msi" No matter how many times I tried to.
Here is how I solved the problem:
Install Git: This link is for windows and will automatically have the file ready to dowload https://git-scm.com/download/win
Instead of installing the latest version, I chose a little earlier version (also 3) but it's 3.2.2 instead of 3.61 (the current one on the Aptana page) : http://www.filehorse.com/download-aptana/11489/