To download the Java Development Kit (JDK) offline installer, you can follow these steps:

1. Visit the official Oracle JDK download page: Oracle JDK Downloads

2. Scroll down to the “Oracle JDK” section, and under the “Oracle JDK 11 (LTS)” or the desired version, click the “Downloads” button.

3. You will be presented with a list of JDK distributions for various platforms. Look for the “ZIP” option for your platform. For example, if you are using Windows, you will find a “Windows x64 Compressed Archive” option.

4. Click the “Download” button next to the ZIP option to begin the download.

5. You may be prompted to accept the “Oracle Technology Network License Agreement for Oracle Java SE.” Review the license agreement, and if you agree, click the checkbox to accept it.

6. After accepting the license agreement, the download should start. The ZIP file contains the offline installer for the JDK.

7. Once the download is complete, locate the downloaded ZIP file on your computer and extract its contents to a directory of your choice. This directory will be your JDK installation directory.

8. You can now set up the JDK and configure your development environment as needed.