Just download the new version and extract it at the same place the old version was if you want to keep your save. You saves might bug with the new version so it just starting anew might be your best choice.
For the text skipping, It should be less frequent in episode 2 than episode 1. Unfortunately I don't think I will patch episode 1 for the text skipping as it is too much work for very little gain.
You can move your mouse wheel up to have access to the backlog if you miss text tho!
Thanks for supporting the game! You can join the discord server too if you want more info and stuffs ;).