I had the same problems 6mths ago.
Bought an after-market regulator and DIY-replaced onto my Fiat Panorama.
As a precaution, I made sure not to lower the window all the way down, so as not to stress the brackets.
The replacement regulator work fine, until recently the tyre mechanic wind it down all the way, and the plastic rail guide cracked.
I am thinking how to DIY/improvise a replacement rail guide.
Meantime, jam up the window permanently closed with rolled newspapers.
imho, I prefer the OPEL Combo power window because it came with auto-stops for both the lowest and highest position.
Like to share some photos of the damaged and replacement regulator.
Faulty regulator
Close-up of cracked bracket
Door panel removed.
After-market regulator
Metal bracket in after-market regulator
After-market regulator installed in door