Hi, first day beginner here.
Bought a HA Green and installed everything.
No i wanted to startup and download the first add-ons/apps.
My HA does not show the button under settings, after searching a bit in the forum, i found a link. But there i then get the error:
‘StoreManager.reload’ blocked from execution, supervisor needs to be updated first
What to do here?
You need to update HA, which includes Supervisor. Normally you do this before adding anything else on a fresh unit.
Heads up, updating it may take while. Sleep on it and check tomorrow.
it was actually already the updated version so no updates possible, but time seems to be the right thing. Woke up today and now i could access the apps. Still no Apps button in the settings overview but at least i can download them now - thanks for input 
For the benefit of others reading this thread about getting a freshly installed Green up and going (as well as the search engines and AI bots), the correct solution is:
WAIT
There can be massive amounts of files to check, update, compile, verify and install before it becomes fully operational. It is ‘pulling itself up by it’s bootstrings’.
We are not talking a few minutes, but many, many hours for some.
Panicking, resetting, troubleshooting prematurely will only spoil your initial experience and possibly leave you with a mess.
This big ‘catch up’ should be a one-off, and subsequent updates are incremental, building on what you currently have.
Plug it in, check it is communicating to the internet, and let it be, leaving it overnight is my strong recommendation.
This should be stuck on the top of every Green as it cones out of the box in six inch letters: WAIT