There are currently three major ways to install gr-satellites:
Installing from the Ubuntu PPA is the easiest and recommended way to install gr-satellites in Ubuntu 20.10 and later versions.
Conda is a multi-platform package manager that can be used to install gr-satellites and its dependencies (such as GNU Radio) in a virtual environment that does not clash with the system-wide set up. It is the recommended way to install gr-satellites in Windows and macOS, and also in Linux distributions which do not include GNU Radio 3.8.
It is also possible to build gr-satellites from source, which is easy to do on Linux systems, and perhaps also macOS, but not in Windows.
Finally, there are a number of distributions that provide their own packages for gr-satellites: