Is it possible to upgrade TMs from Studio 2015 to Studio 2021?

I have recently updated Trados from 2015 (on an old computer) to 2021 (on a new computer). I saved all my TMs on the new computer, but the folders appear to be empty. I assume this must be an upgrade problem. I found and read this article https://gateway.rws.com/csm?id=kb_article_view&sysparm_article=KB0034935, but it doesn't deal with Studio 2015. I am a basic Trados user and not nearly savvy enough to solve this on my own. Can my old TMs be salvaged at all? Thank you!

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