You can download JDK 8 (Java Development Kit 8) for 64-bit systems from the official Oracle website. Here are the steps to download it:

1. Visit the Oracle JDK download page for Java 8: https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html

2. Scroll down to the “Java SE Development Kit 8u301” section, which is the latest update of Java 8 at the time of my knowledge cutoff in January 2022.

3. Accept the Oracle Technology Network License Agreement by clicking on the checkbox.

4. Choose the appropriate download link for your operating system. Select the one that corresponds to your 64-bit operating system (e.g., Windows x64, macOS x64, or Linux x64).

5. You may be prompted to create or sign in with an Oracle account to proceed with the download. Follow the on-screen instructions if necessary.

6. Once you’ve downloaded the JDK 8 installer for your 64-bit system, run the installer and follow the installation instructions.

After the installation is complete, you’ll have JDK 8 installed on your 64-bit system, and you can start developing Java applications.