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: Many modern USB-to-Serial adapters assign port numbers higher than COM 4. Since older versions of Procomm may only recognize COM 1 through 4 by default, you must go into the Windows Device Manager , find your adapter, and manually reassign it to a lower port number (like COM 2).
: Specifically marketed as a Procomm replacement with a similar feel but updated for Windows 11. procomm plus windows 11