Rollback from Mac OS Sierra, how do I get Parallels Desktop back up and running?

Question

macOS

Welcome all! Such a question, everything is not how I can not solve the problem. Installed OS Sierra and Parallels Desktop stopped working. Mac bought already with this program from a bunch of other software for more than 1000 euros. Now I'm racking my brains on how to get Parallels back up and running. I can’t reinstall this program, because I don’t know the account access codes. There is no Capitan backup. I already made a backup in Sierra.
Can I make a new partition on the disk and put Capitan as a second axis? Will Parallels work?
Or do a clean install? But there are suggestions that the backup made in Sierra is not recognized in Capitan.
In general, the main task is to return the functionality of Parallels desktop. I would be grateful for ideas and options.

Answer 1

Parallels desktop отлично работает на Sierra.
Вы уже решите вам шашечки или ехать. Sierra не предназначена для установки пользователям она для разработчиков не смотря на то что есть public beta.
Самые верные варианты.
1. Переставьте систему начисто.
2. Обратитесь в службу поддержки parallels если лицензия таки была.