0.0.82, win10 (64x)
After day ~65 my character starts "sliding" after every jump. He becomes hard to control, like if there would be glass everywhere around. And you have to jump on that place... sorry, I don't know it's name. The place with an anvil. In this version the character kinda stucks on the little step and can't overcome it without jump.
ensure your java is path'd up correctly, and/or update/reinstall it.
It's a .jar - which win-rar can usually read and extract classes and such from it, but it should be runnable like a normal application, it has its own little java applet window for executing its functions with. - if its not running at double click, it likely means either that which I said above, or something else is forcibly taking .jar hooks, but I believe update/reinstall will still address that as well