Can't unzip custom story tools

[Mine Turtle]

Im using winrar to unzip the files and ive bought the game from the website and I am extracting it to the redist folder. I keep getting an error that says access denied.
If anyone knows of a way to fix this it would be extremely helpful, Thanks.

extract it to your desktop and move em into the redist folder manually. you most likely dont have full administrative privileges on your computer, so thats why it denies you access. ^^