having issues updating my phone to windows 10

i have this lumia 635 (it's the 1gb ram model) that i'm trying to update from windows phone 8.1 to windows 10 mobile using fadilfadz01's universal updater tool. the first time i tried it, it was successful, but then i tried updating it some more and it was an epic fail that got my phone stuck in sad face mode (i think it was cuz i tried doing the second update from the phone's windows update menu rather than from the universal updater tool). i had to use wpi to flash it back to the original os and hoped i could try again, but every time i tried it again, i wait like half an hour for the tool to download the update package, i look at my phone's update menu, the progress bar goes up for a bit, and then it just says "the update was downloaded. but couldn't be opened. (80096010)". this is really odd because like i said it worked fine the first time around. how do i fix this error and get it to update properly again?