Unofficial .rar files from 2018 are prime real estate for malware or outdated miners that could slow down your system.
It looks like you’ve come across a file name for a very early version of , likely a "cracked" or pirated copy from December 2018.
BTD6 has changed massively since 2018. You’d be missing out on dozens of new heroes (like Sauda or Geraldo), Paragon towers, Boss Events, and the Trophy Store.
While BTD6 is an absolute classic, downloading older .rar files from unofficial sources is a major gamble for your PC. If you're looking to dive into the game, here is a quick breakdown of why you might want to reconsider that specific file:
Pirate copies can’t sync with Ninja Kiwi accounts, meaning if you ever switch devices or your data gets wiped, your progress is gone forever.