Download the latest setup program from the official Cygwin website .

The symptoms of the Cygcrypto11.dll 2021 error can vary, but common ones include:

Compiling software with g++ 11.2 (released in 2021) sometimes led to ldd (list dynamic dependencies) failing to find the library.

You are running an older app (e.g., from 2021) that requires cygcrypto-1.1.dll , but you have a newer Cygwin version that uses a different version of OpenSSL.