Hi!
How can I download and update without uninstalling (losing all presets, twitch pairing, etc.) and installing like a brand new one? 
Also second question; I saw the folder with FallingObjects1 and 2 - I pasted my custom elements there and it doesn't work. How can I add these custom falling, smashing/kicking objects?

Good morning, updating to a new version is automatic. All of your save data is separate from the program folder so you should just be able to download the new version and start using it with no issue.

The falling objects and such should be working fine. They have to be a .jpg or .png file. After you add them to their folders you have to restart VTuber kit so they can initialize