I researched this issue in order to answer this related question.
What I found is that there is pretty much no way to read the file short of the software supplied by the Sky Ebook Reader Company. If you have a legitimate .sbrz file and are unable to read it on your Windows machine with their software, your best bet is to seek support from that company.
According to the FileSuffix.com website, this suffix is for the "Sky Ebook Reader Encrypted Ebook". Because the file is encrypted, it is not (generally) legal under DMCA to remove the encryption (in the US). And of course, as you certainly have already found, the Sky eBook Reader company only offers their software on Window.
The format is not used by any of ...