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I've been using TT for at least twenty years. What am I supposed to do now?

 

I've got TT CDs for the years 2016 - 2020. I usually purchase TT at Costco on CD, but for 2015 I bought a PC download at Amazon. My PC crashed 12/2016 and I lost everything on my hard drive. I just checked on Amazon and even though they still show my purchase, the download or CD is no longer available. I also moved to an iMac after my PC crashed and need the 2015 for Mac version. Where can I get it?