Doing some testing, I found the solution and write it here in case someone else has the same question:
Connect the device via USB to the PC (ok, that's obvious) and open the file directory.
You'll see (for example) : D:WhereYouGo , but in fact it's C:m...sdcardWhereYouGo.
The programme asks you to save the .gwc-files in WhereYouGoDirectory, but it won't find the files if you create a new file named "directory". Just download the gwc into the WhereYouGo file and it'll work.
:-)
Connect the device via USB to the PC (ok, that's obvious) and open the file directory.
You'll see (for example) : D:WhereYouGo , but in fact it's C:m...sdcardWhereYouGo.
The programme asks you to save the .gwc-files in WhereYouGoDirectory, but it won't find the files if you create a new file named "directory". Just download the gwc into the WhereYouGo file and it'll work.
:-)