Just found that only
French (and Canadian French)
Portuguese (and Brazilian Portuguese)
Can be spell checked without making a custom dictionary.
I use two (Eng & Dk)(not custom) on even Notepad.
So not hopeful about switching language.
Complete and total waste of time. Installed veeeery slowly but finally did, registered ok with the provided key, put 3 shortcuts on the desktop but on clicking on either of them I got the messages, “recovering from a shutdown” but it never does. Zilch, not a working app, totally useless, crashes ALWAYS before even starting. Repaired 3 times (more wasted time) same result. Also tired to run as admin. Gave up! At least at last go, it removed itself completely, barring what junk it might have left in my registry. Avoid!