The BlynkSimpleEthernet.h file is not downloaded as a standalone file; rather, it is included in the official Blynk library package. You can install it using the following methods: Open the Arduino IDE .
BlynkSimpleEthernet.h is a critical header file within the Blynk C++ Library that enables communication between Arduino-compatible boards and the Blynk Cloud via Ethernet. It is most commonly used with the , , and Go to product viewer dialog for this item. Ethernet shields. How to Download and Install