If it contains .ino or .cpp files, move them to your Arduino/libraries folder to use them with your hardware.
Are you trying to set up a specific IoT device with Blynk, or What a ZIP File Is and How They Work - Dropbox.com Download BLN TNK zip
While there is no single official software package or widespread standard archive known as "BLN TNK," the terms likely refer to (BLN), a popular IoT (Internet of Things) platform, and Tenecteplase (TNK), a medical injection. If it contains
If you cannot open the file natively, you can use utilities like 7-Zip or WinZip . 4. Application and Use and Tenecteplase (TNK)
The process for downloading a ZIP file is standard across most modern web browsers.