I can wholeheartedly recommend the Twilight of Divine Right rules. I've tinkered with various rule sets for ECW and TYW, including my own for decades and I think these have the best combination of playability and flavour I've found (so far!).
I bought them about nine months ago, and I've played them several times (and bought more Pendraken TYW stuff as a result) - all solo of course under current circumstances, but they have fired my enthusiasm to kick off a small TYW based campaign based around a small Duchy defending the Palatinate. The Duke is a bit like Christian of Brunswick but not as mad (probably). We'll see if he is any better as a general over the next few months!
Hwiccee is always incredibly helpful and supportive if you have any queries.
Sorry they aren't in pdf but bite the bullet and buy a tree based version (renewable forest locks up carbon in the new growth you know!)