This download does not include the JDK. You can connect to and use any JDK 1.7 or above.
To install and run:
- Ensure you have a JDK installed, if not, download here - Download the file above - Extract sqldeveloper.zip into any folder, using folder names - Within that folder, open the sqldeveloper folder - Double-click sqldeveloper.exe - You will be prompted to enter the path to the Java JDK home. This only occurs the first time you launch SQL Developer.