You can install the PHPoC library via Arduino IDE.
Run the Arduino IDE.
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Click the [Sketch] > [Include Library] > [Manage Libraries...] menu.

Search "phpoc" on the Library Manager.

Select the PHPoC library and press the [Install] button.

"INSTALLED" message will appear on success.

Confirm the "PHPoC" in the [Scketch] > [Include Library] > [Contributed libraries].

Confirm the "PHPoC" in the [File] > [Examples] > [Examples from Custom Libraries].

※ Note : PHPoC Expansion library can be installed in the same way.