How can i install old version of IDE, without uninstalling the other version?(How can i install several IDE version in same laptop).
Arduino.cc have a guide :
The gist is:
Download the desired version in ZIP format
Unpack the content in the zip file to a folder
Start the arduino.exe in that folder.
Remember that you have to place all libraries, board definitions in that folder.
The folder can be copied to another computer or a USB stick....