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Download Portable Vivaldi snapshot Online (0.8 MB) 02/09/16
In first screen enter: 1.10.845.3
Download Portable Vivaldi stable Online (0.8 MB) 26/04/16
In first screen enter: 1.9.818.50 or 1.0.435.46 for XP/Vista
PPAPI Flash Plugins
Extract and run VivaldiPortable or VivaldiSnapshotPortable (stable and snapshot have their own folders and settings).
Settings of installed Vivaldi should be preserved.