There is no freeware Piper Warrior aircraft. That plane was developed by Just Flight and it costs money.
There are a few freeware planes available on flightsim.to, and at least one on simouthouse.com (the DH-89 Dragon Rapide, it’s actually quite good). Rob Richardson is another freeware author for MSFS. A few of the freeware planes are pretty good. The freeware Goose, if it still is there is quite good. I haven’t tried many of the others as I like to pay developers for their work. As it seems you’ve found, many of the freeware ones don’t work very well, mostly because the bar keeps moving, and those developers don’t have the time to keep up with the changes because they have families and other jobs.