You can download JDK 8 (Java Development Kit 8) for Windows 10 64-bit from the official Oracle website or from other trusted sources. Please note that JDK 8 is no longer receiving public updates from Oracle, but it can still be useful for certain legacy applications.

Here are the steps to download JDK 8 for Windows 10 64-bit from the official Oracle website:

1. Visit the Oracle Technology Network (OTN) Java SE download page: Oracle JDK 8 Downloads

2. Scroll down to the “Java SE Development Kit 8uXXX” section, where “XXX” represents the update number.

3. Accept the “Oracle Technology Network License Agreement for Oracle Java SE” by clicking the “Accept License Agreement” radio button.

4. Download the appropriate JDK 8 version for Windows x64 (64-bit). Look for the “Windows x64” download link and click on it to start the download.

5. Once the download is complete, run the installer and follow the installation instructions to install JDK 8 on your Windows 10 64-bit system.

After installation, you can verify that JDK 8 has been installed successfully by opening a Command Prompt (CMD) and typing the following command:

This command should display information about the installed Java version, including JDK 8.