The native Windows Aspell port is no longer supported. Instead, use Aspell in Windows via WSL or MSYS2. Check spelling of a file like:

aspell -c myfile.txt

From Windows Subsystem for Linux:

apt install aspell

Install from MSYS2 Terminal:

pacman -S mingw-w64-x86_64-aspell mingw-w64-x86_64-aspell-en