I have been a huge fan of SEO tools for Excel since I saw a presentation using it back in 2012. I have since switched to a mac, and now the only reason I keep a windows partition is because of SEO Tools for Excel.
Looking at the release notes for Excel Mac 2016, VBA add ins theoretically work with it (though they provide sub-par editing/debugging support). Would there be any plans to make compatibility for Mac?
Unfortunately, making SeoTools compatible with OS X would mean rewriting it from scratch. Your best option is running virtualized using something like Parallels.
I'll go over how to set it up in the most convenient way in a future blog post.
To address the Mac issue and a possible solution for that: is it planned to transfer SEO Tools to Excel 365 in the cloud? This way everyone regardless the OS can use the tools online.