The remoteit package, which was released in May 2020, is included only in the Raspbian Buster Repository.
If you are using Raspbian Buster, you can run:
sudo apt update
sudo apt install remoteit
To install remoteit on Stretch or other Raspbian versions, please note that it should work, but we have not tested this extensively.
Run:
sudo apt update
wget https://downloads.remote.it/debian/latest/remoteit_armhf.deb
sudo apt install ./remoteit_armhf.deb
Then you can pick up the rest of the setup instructions here:
https://docs.remote.it/adding-remote.it-to-your-device/the-remoteit-package-for-raspbian
(skipping the first paragraph which doesn't work on Stretch).
If you already have Services configured using the older connectd package
The remoteit package offers the Admin Panel as a new feature compared to connectd, but otherwise connections and scripting should work the same. We do not consider upgrading to remoteit mandatory and any deployed systems with connectd will continue to work without upgrading.
If you previously have installed connectd version 2.4.26 or later, installing the remoteit package should convert any existing Services that were installed using the interactive script connectd installer.
To check the version of connectd, run:
sudo dpkg -s connectd | grep Version
If your version of connectd is older than 2.4.26, you will receive a warning message and your existing Services will not be converted.