Later versions, such as Procomm Plus 4.8 and Procomm Plus 5.0 (often called "Procomm Plus for Windows 95/NT"), were 32-bit applications. Windows 11 does support 32-bit applications via the WOW64 (Windows 32-bit on Windows 64-bit) compatibility layer. However, "support" does not guarantee "function."
Even if the 32-bit version installs, you will face: procomm plus windows 11
Your only path is Windows XP in a VM (Hyper-V or VirtualBox). No modern terminal emulator runs Procomm’s proprietary scripting language. Later versions, such as Procomm Plus 4
Legacy Telecommunications in a Modern OS: A Technical Evaluation of Procomm Plus Operation on Windows 11 procomm plus windows 11