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Is it actually broken, or is door misalignment stopping it from throwing fully so you can't lock it?
If you're sure it's the correct one*, it is just a screwdriver and probably a hacksaw to cut the new one to length.
Mark door with position of latch, so the new one can go at the same height.
Remove handle screws, handles and spindle.
Remove cylinder screw. Turn key to 11 or 1 o'clock position to line up cam. Remove cylinder.
Remove faceplate screws.
Pull gearbox out
......*. The Millenco has unusual PZ measurements between the centre of the cylinder and handle spindle of 117mm.
There's another two options with 4 roller and upwards hook. But both have 92mm PZ
Fullex Xl
Kenrick Excalibur
user69121
Has anyone ever replaced a multipoint door lock on a upvc door? On the surface it looks like a case of unscrewing the old one and attaching a new one (assuming the new lock is specced correctly - this is what I'm looking at https://www.lockmonster.co.uk/item/millenco-latch-1-hook-4-rollers)
I'd rather not pay someone to come round with a big screwdriver and do something that was possible myself!