Yeah its only aobut 2.2mb, but it does work. I have used that method as well.
And OPL 0.8 is embedded with the HDL Server, more info can be found in the Settings Tab above.
Its all in the guide.
Just to mention it.
You can install ESR-Disc through HDLoader only with the help of another ELF and with the ESR-Disc.
No need for any awkward disc-swapping-solution.
1. Insert your ESR-Disc.
2. Start either the ESR-MC-Version, or use the feature to start an ELF within ESR-GUI.
3. uLE should start. --> Search for HDLoader.ELF and start it.
4. Choose install, install the game and turn-off HDL after installing.
You can't start games through HDL, when the ESR-Driver is active.