The 12dicts lists are oriented towards common words. Scowl is the basis for the official english dictionary in aspell and the en_us, en_ca and en_au dictionary in hunspell. For one thing pspell has been merged with aspell so there in no longer two separate.
Aspell has undergone an extremely large number of changes since the previous aspell/pspell release. Aspell will also do its best to respect the current locale setting. If none of those dictionaries are suitable for your needs a simple web app is available to create a customized.
The best way to get aspell for windows is to use the msys2 binaries. Premade dictionaries are available for hunspell, aspell, and as plain wordlists. Dictionaries for british english are also available for. You do not need to be subscribed in order to post, however if you don't subscribe your post will need to be approved.
It differs in several important ways from most of the other free word lists you can download. If you're looking for myriads.