An Oldie.. but goodie

I wasted one week with making a book, that at the end would not open... 99 pages.. .book frozen. Nobody from mypublisher can give me a reason, but I hear that they are not compatible with Windows 10, so in the end it did not work out. They could have told me that one week ago.
Now I have to start from scratch with another publisher. I feel 'sick'.
OK, I WORKED WITH THE NEW PROGRAM AND IT IS ACTUALLY BETTER... SO IT WAS A GOOD THING THAT HAPPENED TO ME!