Provided that your theme author didn’t modify the VC version that came with your theme, buying your own license of the standard VC version should fix it. But it really depends on whether your theme author made changes to VC, and if so, what kind of changes, so you should inquire with your theme author first, if s/he is still available. If the theme is still supported, the theme author should, however, provide you with the required update.
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