I've done quite a few installs on Mk5 and more on Mk6s. Make sure the bottom of the strut carrier is open as much as it can be by your tool. What I use but don't recommend (but works every time) is a 2x4 w/ the floor jack under it, pushing up on the bottom of the lower spring mount
I've done the install 50+ times and this has become my new method since it was the only way to do it on my old B7 Passat.
My quick DIY:
Front end on jackstands
Wheels off
Remove sway bar endlinks from both sides
Remove strut pinch bolt
Lube up base of strut with oil/WD40/etc
Insert strut spreader
Swift kick to the hub to break the strut free from the spindle
Remove lines/wires from their harnesses (for extra slack)
Use a 2x4' to jack the strut up & out of the spindle
Rotate hub forward slightly
Lower jack & 2x4' so it clears the spindle
Remove the 3x 13mm bolts that hold the strut to the tower
It's out of the car
Install is the reverse order except you need to jack the strut up & sort of "walk"/wiggle the base of the strut close to the spindle to get it back in. It's not hard, but it may or may not be a cake walk either.
Repeat for other side
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