• Minecraft Version: 1.8.9
• BetterFps Version: 1.4.5-1.10
  I just download BetterFps mod then open it and choose "Install" but it not showing any version for me to install
  

same problem...... i have 20 fps i want to play normally......

1.4.5-1.10 is for Minecraft 1.10, that's why no version appears.
Please, make sure the version you have downloaded matches the Minecraft version you are playing.

i have the same problem and im on Mac, I hope this gets fixed soon/the creator tells us what we can do