On Fri, 02 May 2014 10:19:25 GMT, Sönke Ludwig wrote:

It's dub remove ... --version=... - not very pretty, but consistent with other places where --version is used. See also dub remove -h. I'll improve the error message to indicate the proper syntax.

As of 7b7ca05, now prints: 

Error executing command remove: Please specify a individual version using --version=... or use the wildcard --version=* to remove all versions.

I had resorted to going into AppData and deleting things manually. FWIW, in the description of the -h flag, the bit about "command specific help" didn't jump out at me until after I read your post here. dub commands just became much less arcane. Thanks!