Thanks for information. Next time i will definitely do more research and will avoid buying masternode coins that requires "sentinel" even if i find something very cheap.
Cause its too complicated too fast. And in the end of the day - I can't make it run.

Honestly I think that masternode creation process is already very complicated with console commands with bunch of keys and with absolutely strange requirement of "1 transaction" not more than "x" coins.
But this watchdog thing makes everything much much more complicated and weird (why its not included inside the wallet itself ?).

Regular POS with fixed big reward for holders of huge amounts (more than x) of coins that have wallet running for full day or two would be much better.