Can't install on Win XP
Can't install on WIndows XP.
Get "ReleaseSRWLockExclusive can't be found in Kernel32.dll"
Yeah, last for WinXP is https://downloads.vivaldi.com/stable/Vivaldi.1.0.435.46.exe
That error is from an API available start from Win Vista.
A later version than 1.0.435.46 can't be installed (as dLeon said) on win xp because Vivaldi is based on the chrome-code and chrome dropped the support for win xp last year.