Please install another localhost on your computer for Evolve 1.9 and Import all demo content.
You can then use that as a reference for your current work.
In version 1.9 you can set sidebar layout for each post or page.
For your current work. You just need to backup the whole copy of your current parent or child theme with any modifications that you made, keep it, and in case you need it, you can always revert back. It’s advisable to update theme because there could be some critical bug fixes and new features.
Perhaps it’s because I am new to this job. I cannot find the Yoga example that you mentioned on our demo site.
Please kindly post the url to the demo page here.