The first example on the script's page shows the command that will create 20 numbered folders, My NumFolders 1
through to My NumFolders 20
:
CreateFolderEx NAME="My NumFolders" NUMBERED="end=20"
Change the 20
to 50
if you want to create 50 folders instead.
For how to create a button which runs that command, see the Raw Commands section at the top of this guide: