At the moment there is no download available, because of the „script ran too long“ issue.
What it does:
Personal Mount Favorites is a simple addon, saving your favorite mounts for each single character.
When loaded for the first time, your current favorite mounts are stored locally, so you can always restore your collection. Afterwards, each character can have its own set of unique favorite mounts.
There is no configuration needed. On first login, Personal Mount Favorites saves your current selection of favorites. After that, each change will be saved per character.
How can I see if it's working?
After login there should either be a message displayed that your mounts have been loaded by the addon or that the current selection has been saved (on first login).
Your favorite mounts are updated every time you're closing the Mount Journal.
Personal Mount Favorites verifies that you don't clear the list of your character's favorite mounts accidentally. So if, for example, you're closing the Mount Journal with the "Collected" filter unchecked, then changes are not applied. The addon does only save entries which are currently displayed in Mount Journal.