Re: BF 1 Revolution sale already own standard edition
I think it would rather replace it, that depends how many packs you´ll have to download.
If Premium is a seperate file then you can just install that one.
If Revolution is a complete package, then you´ll have to download it again.
But that doesn´t matter, it will work anyway.
If your store won´t let you buy the Revolution Edition (because it tells you that you already own the game) then erase it from your HDD.
But don´t delete your saved profile data, just the game file.
After that you should be able to install Revolution.
And don´t worry, if you´re using the same account then you won´t lose your progress/rank/unlocks, that´s all saved on EA´s servers.
Here´s another topic where I´ve posted several links:
https://answers.ea.com/t5/Game-Information/BF1-Revolution-or-Premium-PC-version/m-p/6587294#M11050
Have fun with your Premium/Revolution experience 🙂