Set OFF Auto-update of Adobe Illustrator
Setting off auto-update of Adobe Illustrator may be a good option if you would like to evaluate new version thoroughly before updating.
The latest information of Adobe Illustrator can be found from below link.
NOTE: Adobe Illustrator release notes
We would like to explain how to set off auto update of Adobe Illustrator.
Automatic update of Adobe Illustrator
Please check your Adobe Creative Cloud setting about application update. If you are choosing "Auto-update", all your applications will be up-to-date automatically.
In case you do not prefer this, you can turn off the setting as explained below.
Set OFF Auto-update
1) Log into Creative Cloud
Creative Cloud > "Preferences"

2) Set Off Auto-update
Turn "Auto-update" OFF as marked below.

If you set off "Auto-update", you will NOT be applied auto-updating when an update is released. You may update manually when you decided to.
Update Illustrator without removing OLD versions
Regardless of using our plug-ins, when you update your Illustrator we would highly recommend you to keep older versions. In case a new version has unexpected befaviours, you can still amange to use Illustrator and our plug-ins
Please kindly follow below settings before updating.
How to uncheck "Remove old versions"
1) Go to Update
Updates > Click "Update" of the application

2) Uncheck optional settings
The following pop-up will appear. Please UNCHECK both "Import previous settings and preferences" and "Remove old versions" .

When you ensure both are unchecked, please click "Continue" to complete.
Remarks
Please note that you will need to re-install our subscription plug-ins when you update your Illustrator. Our plug-ins will NOT be migrated to the new Illustrator version automatically.
Please download the latest version of our plug-ins and install them.
In case you keep both "Checked" and complete the installation, all the other versions of Illustrator will be removed. This case, you will not be able to use any of our plug-ins that work with the deleted versions.
If you need any further supports, please feel free to contact us.