Love this plugin, especially when importing blogs from other platforms to WordPress since categories are all imported as tags. Saves me so many hours. Thank you! Also, still works perfectly with 5.5.3 for me.
It worked perfectly. I couldn't find another to do this. WordPress has one, but it only converts default categories and tags, not taxonomies for other post types. In my case, I needed it for WooCommerce.
After I used it, I read the support and saw it doesn't work on php 7. Mine was set to 7.2.27 and I had no issues.
I realized later that I had looked into another plugin called Term Management Tools. That might work if this one doesn't.
For starters, the plugin has deprecated code and produces errors on PHP7. Looks like the code hasn't really been touched all that much in many, many years.
The biggest problem is that when the terms are converted, the term descriptions are removed.