I want to connect to Amazon VPC using AWS Client VPN on Linux on ARM CPU

AWS Client VPN is only supported on AMD 64 machines

For the VPN client provided by AWS, it seems that only AMD64 version has been released.

To use AWS-provided Linux clients, you need the following:
Ubuntu 18.04 LTS or Ubuntu 20.04 LTS (AMD64 only)
Connect using a client provided by AWS - AWS Client VPN

...but AWS Client VPN is the same specification as regular VPNs and seems to be able to connect using OpenVPN clients provided by non-AWS, so you can connect using OpenVPN clients built for ARM64.

The following steps show how to establish a VPN connection using the OpenVPN application on your Ubuntu computer.

To establish a VPN connection, install OpenVPN using the following command:
sudo apt-get install openvpn

Loads the configuration file received from the VPN administrator and initiates the connection.
sudo openvpn--config/path/to/config/file

Connect using the OpenVPN client application - AWS Client VPN

The official OpenVPN site also distributes binaries for arm64.

OpenVPN Client For Linux|OpenVPN
OpenVPN3 Linux – OpenVPN Community