Jizerské hory and Krkonoše are very nice area, I like it too! Fortunately I found the Ještěd tower in my FS. Please try to download it from this link: https://drive.google.com/file/d/0B7pXIfP6KXacNnpERDRCb2FmNjA/view?usp=sharing
I suppose you know, how to install it. In case you can't download it, provide me your email, and I will send it to you directly.