Has FlexIDX Home Search been discontinued?

I am developing a new website for a real estate broker. I installed flexmls IDX, but quickly became disenchanted by its conceptually flawed design and limited options. FlexIDX Home Search looks much better and more like I expected flexmls IDX to be, but it was last updated 2010-10-26 and is shown as being compatible only up to WordPress 3.0.5. Has development been discontinued?

https://www.ads-software.com/extend/plugins/flexidx-home-search/