Hello & Welcome,
Do you have a test light or multimeter to do some testing?
OK - Thanks.
Is there any way you can get one of these tools, such as borrowing from a friend?
It could be a fuse. Sometimes there are fusible links that are in there too, for some of the main power drawing areas. That is why I would like to do some testing.
Did you actually see any sparks or indication of problems while changing the window motor?
Do ANY electrical systems work in the car?
I think the first step would be to get a 12 volt test light or multimeter to be able the check the connections and fuses as close to the battery as possible.
Please let me know when you have one of those and then we can proceed to do some tests.