Ummm. If you upgraded the individual template files using the current ZC responsive or where not available template default files to compare then it should be possible to continue using the template.
See the template files at one point were from one or the other template sets. They were modified to some extent to offer some sort of different view. Then other code added in around that to maybe add this or that feature. Meanwhile underneath the code still was basic ZC template file operations code. Well, in many cases, that code needed to be modified to support ever stricter requirements.
Basically like a plugin is to be incorporated into a template, the template needs to be incorporated into the ZC default files.
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