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Download Portable Vivaldi stable Online (0.8 MB) 21/06/19
In first screen enter: 5.2.2623.41 or 1.0.435.46 for XP/Vista
Download Portable Vivaldi snapshot Online (0.8 MB) 21/06/19
In first screen enter: 5.3.2658.3
Extract and run VivaldiPortable or VivaldiSnapshotPortable (stable and snapshot have their own folders and settings).
Settings of installed Vivaldi should be preserved.