Fast Upgrade

  
do we need to uninstall outsystems 9.0.0.36, if we need to upgrade from 9.0.0.36 to 9.0.1?
You can just upgrade to the new version.
Here you can find the checklist:
http://www.outsystems.com/home/document-download/1182/88/0/0 (.NET)
http://www.outsystems.com/home/downloadsdetail/88/1183/ (JAVA)
The first dropdown states the kind of task. First install or upgrade.