latest update- 17/4

hi, I'm trying to update my game after the latest update and its saying i need to update but when i try its saying that there isn't enough disk space on cache c. however i have cleared the cache and deleted almost everything and each time i try update it says a different amount of space i have . for example it needs 300 but it'll say 154 or 250 each time it'll change. will i have to delete  more stuff or what? 

any help much appreciated.