hey ... is it still possible to get to the FCN GUI, like before March 7, 2017 ?? like here: https://postimg.org/image/wjff3svhb/ I can't
No. That software was abandoned because the company that made it went out of business apparently. It's unsupported, and was gathering some exploits. We had to replace it.
Did you even read the reply in its entirety? The old software is gone. Kaput. The new software interface is exactly the same across all platforms—tablets, phones, desktop PC's, California, Moon... No Flash required. No more Flash updates required.