We do not find many installable dictionaries since they all seem available for free on the internet. Rummaging good, I found four: one, Robert & Collins, Oxford and Ultra Lingua. I am Harraps Collins and paper and Windows version, the paper version remaining what we do best. In Windows version, the big problem is the interface built in Windows 3 (about), that is ugly, very ergonomic and ultimately less exhaustive than paper versions. The less ugly that I tried because it has been updated for some time there is Ultra Lingua but it is much less comprehensive than the other three and therefore too expensive for a quite content to the end thin.