if you have the old download then you can just install it. Check your recyclable bin to see if you still have it in there. I kept mine cause i wasn't sure how much i would enjoy lspdfr 0.4 i used to hate it but since i've gotten use to it i've enjoyed it. my lspdfr still crashes but its all trial and error just like fivem. They have a lot of problems to fix with updates but they make sure to figure out whats wrong and do what they can to fix it.