I found a forum where someone else had the exact same problem: when switching to another account on a pc, Blizzard forces a redownload of Warzone because one account has only Warzone and the other one has the full game. Please fix
I just tried linking my accounts on Blizzard and I have to start all over and buy the game again? I bought the ultimate edition and should be able to download on my PC also shouldn’t I? Was this your issue as well and did you get it resolved?