I’ve seem to have fixed my problem. After two days of troubleshooting, I was able to identify and resolve the issue causing the BLZBNTAGT00001389 & BLZBNTAGT0000138F errors. The problem appeared to be a combination of a corrupted Battle.net cache, misconfigured network parameters, and registry inconsistencies interfering with the installation process.

By clearing the Battle.net cache, resetting relevant registry keys, and adjusting TCP settings to stabilize the connection, I was able to restore proper communication with Blizzard’s servers. Additionally, disabling IPv6 and running a full system integrity check helped eliminate any underlying OS conflicts.

After applying these fixes, the installation completed successfully.
In other words it fixed itself.

Games has been successfully downloaded and is now playable.

I’m not sure if unplugging and replugging the internet cord did the trick but it might of played a role.