Tried to install 2.9.24 via PXE on a Soekris 4521 today and it’s giving errors that the demo license is expired. Beware!
Starting...
Checking disk integrity...
No errors found.
Completing installation, this may take a minute:
processing console information ... done
Installation complete
Generating SSH RSA key...
Generating SSH DSA key...
Starting services...
Demo license expired!
Please reinstall the router.
connect failed (errno=2)
Shutting down...
Stopping services...
connect failed (errno=2)
System halted.
Cause:
Your upgrade License is probable expired. 
Get a new license code (renew) and apply the license code to netinstall and run it again.
(Make sure you select keep current config.)
This hapened to me on a RB5XX … 
My head still hurts from banging me head on the desk… 
Craig
Well, I had 2.9.18 installed on it (trial) with 10 hours left on the demo. Needed to test something on 2.9.24, so ran netinstall on it via ethernet. Seems like reinstalling to 2.9.24 shouldn’t have been a problem, but no go. So, I did the same thing with 2.9.23 and it installed just fine. 2.9.24 refuses to install though 
there was another post about this. It’s a problem with 2.9.24 i believe. Normis stated wait for 2.9.25 or go back to .23 ?
I ended up registering this test device (something overdue anyway) with 2.9.23 then upgrading to 2.9.24. It’s a subtle way to get people to buy licenses I guess 