Question: Is there an option from the VSA to clean up LAN cache folder?
Answer: At this time there is no such functionality, the content of the LAN cache folder is not removed by Kaseya and it needs to be maintained by the admin. You can delete the information in it if you wish, from there if a file/patch is needed the process again will re-download it for the machines requesting the information.
Note: If any changes need to be made to the LAN Cache it will have to be re-created it so it can be properly configured again.