Remove DRM from Kindle

It used to be so easy in Calibre, but now it doesn't seem to work anymore.

I want to remove DRM from my Kindle ebooks.

I just downloaded one book .AZW3 from Amazon to test. I also tried to rename the extention to just AZW.

I updated to newest Calibre and newest DeDrm.

Calibre imports book, but when I try to wiew or convert is comes with a message that it cannot be done because of DRM :-(

I also tried a tool called Epubor Ultimate - it said that it had removed DRM, but I still could not view in Calibre (Due to DRM)

Any ideas on how to do it now ???