This information applies to all versions
There is no need for any extra installation procedure: once DxO ViewPoint has been activated, you’ll see a dedicated palette in DxO PhotoLab called ‘DxO ViewPoint’, along with icons for DxO ViewPoint’s features in the menu bar.
Flip and Mirror tool will be available in the menu lmage > Orientation and by right-clicking on a thumbnail in the image browser.
Please note: New features of DxO ViewPoint 5 such as new ReShape Fusion icon are only available from DxO PhotoLab 8.