It's already automated with a Cygwin shell script. I'll generate dictionaries for all languages if you think it's necessary.
The point here is that Christian would like to know how to automate the generation of dictionaries, namely having a look at your cygwin script. Same hold for the installer. The more people understand your code, know how to build and modify it, the better the installer can be maintained. If there is no conclusion regarding where to put backup dictionary files, I will put them to http://www.lyx.org/~bpeng and add this backup link to the installer. Cheers, Bo