So recently I watched One Punch Man in 60fps entirely. I remember a while back ago I tried this before but it didn't work, maybe I did something wrong back then, but it's fairly simple.
You'll need MPC-HC (video player, can also use VLC but i cant figure out how) and SVP4 (it can be the free edition). Just do the minimal install, and when you first run SVP4 it'll lag like shit then you can adjust the performance settings. I recommend going to settings and disabling hardware acceleration as this'll heat ur GPU up (I was hitting max gaming temps, 99 degrees).
Download your anime and play it through the MPC-HC player with SVP4 running. It should be 60fps interpolation now. There is also a SVP extension to allow you to make Crunchyroll videos 60fps, so you don't have to download the anime.
Here's a little snippet of how smooth your anime will look.