Adobe Digital Editions 4.5.2 not responding

I had to reinstall ADE after Windows 10 Update (from hell), can only install 4.5.2. Every time, except once, I try to download a book ADE stops responding. Every time I try to open a book, except once, ADE stops responding. I have tried downloading from both the library and Google Play but the same outcome, not responding. No idea why the one book is downloaded after multiple attempts or I can open it, after multiple attempts. What is the problem? Is it 4.5.2 or Windows 10? 4.5.1 worked fine under pre-update Windows 10.