I'm sorry it has been three years that no one has answered the "VERY basic question" about PiVPN when it had been posted to the OpenVPN Access Server section of the forum.
The VERY basic answer is PiVPN sets up the OpenVPN *Community Edition* on the Raspberry Pi which is a device with an ARM processor.
The OpenVPN Access Server is not currently being packaged or available for the ARM processor.
As a side note, blindly following instructions to take the output of cURL and pipe it into bash as a method of setting up a VPN seems a little crazy. If the target is Raspbian then it really should be packaged and installed as a dpkg.
However, if you did follow the "curl | bash" instructions, then to report issues with PiVPN consider following the Feedback and Support section of the documentation for it:
https://docs.pivpn.io/#feedback-support
If you are having problems using the OpenVPN Community Edition server that PiVPN setup because of issues with a specific client, please make note of which client you are using.
If you are using the OpenVPN Community Edition as the client then the Community Project section of the forum may be able to assist.
If you are using OpenVPN Connect client then there are specific sections of the forum for each of the operating systems that OpenVPN Connect is available for.
