Installing Aptana Studio in passive mode bypasses the installation of Git for Windows and Node.js.
Aptana_Studio_3_Setup_3.6.1 /passive /norestart
(I am unsure whether Aptana Studio will work properly without those “prerequisites”, but it appears to.)
If you want a global installation in a specific directory, the command line is
Aptana_Studio_3_Setup_3.6.1.exe /passive /norestart ALLUSERS=1 APPDIR=c:\apps\AptanaStudio