@boja2020 when you start installing the node-red node (i asssume you do it from the Pallete Manager) it shows you a show log button after a couple seconds.
Click there and check the installation log.
Check specifically for something like:
unsatisfiable constraints python (missing)
Fore each of missing packages the log shows you, you have to go to
Supervisor > Node-RED > Configuration, and add it to system_packages list. ATM mine is like this:
system_packages:
- make
- g++
- gcc
- python2
Hopw this can help you! cheers