I installed Crossover and then EditPlus. The app starts up great: but the feature I was most interested in - mnemonics - is not working. They should be activated by hitting option + < Key> but instead European characters are placed in the editor panel.
I asked in support from Crossover and the answer is:
Use Command + letter
This does work. There is a separate problem then is that the movement keys using Command such as
Commandright arrow for End
do not work. But I'll handle that separately.