hello and welcome to the forum,
--- rclone is a portable app, does not need to be installed.
--- you can save it in your home dir or anywhere you have permissions.
--- download rclone from
https://rclone.org/downloads/
--- check out this example i posted
https://forum.rclone.org/t/rclone-is-removed-after-synology-dsm-update/31285/9?u=asdffdsa