Oracle Database 18c (18.3) is available for download for windows platform since August 22, 2018. If you are new to Oracle or if you are a developer and need a database to play with, you can install an Oracle database quickly on your laptop with a few clicks.
Download the software from Oracle Technology Network. Unzip the downloaded file. Remember, the directory where you unzip the software is the ORACLE_HOME. From 18c onwards, there are no copying files from staging location during the install, you unzip the files to the designated Oracle Home directory.
Click 1: Initiate the installer