If you are running a non-English version, then extensions will not be installable and you should revert back to your previous version. If you expected the extensions in your previous version to migrate, I'm afraid Adobe does not perform courtesies of that nature for its customers anymore. If by "activate" you mean install then also note that Adobe, in trying to herd business to its App store has discontinued the availability of a working desktop Extension Manager. Several of the larger extension developers have created their own free ones. So, if installation is your issue, then our Extension Manager will enable you to install ZXP versions of your extensions into Dreamweaver CC 20XX and all other CC apps. Again, please note that the non-English versions are broken and you will need to revert. You can find our EM here:
PVII Extension Manager for Adobe Creative Cloud