So I downloaded this brick pack called 1randompack from the RTB archive as it had a brick I really needed for my builds but when I start up blockland I get this message. I looked at the console when I saw the add-on wasn't on the list and when I try to open the .ZIP it says "Windows cannot open the folder" then says it is invalid.
Did I download it incorrectly or is it just the file and should redownload?