Electrical – How to install new chandelier when impossible to fish wires

The dimmer is blown, trying turning off the breaker and connecting the line and load for the chandelier(bypass the dimmer), and see what happens when you turn on the breaker. Most dimmer manufacturers recommend using a toggle switch to test new light fixtures, that way if there's a short you don't kill a good dimmer.

1.5 wire needs to be protected by a 16 Amp (or weaker) breaker. You are fine on that front.

Your total wattage will be 10*40W*2 = 800W; on a 220V line this will mean 800W / 220V = 3.6 Amps. So overload is not an issue assuming there is nothing else on that breaker. (If there is then add the wattage to the 800W and divide again)

You should also extend the ground wire if there is one, this is a green/yellow wire and should be connected to the ground connection of the chandelier.