Upgrade older Chess King Mac to Chess King 21 Mac (download)


Price: $34.95

Upgrade to Chess King 21 Mac from any version older than 2-3 years.
Prior owners of Chess King get a discount for upgrading and get on top of that 3 months of 74 Chess King Courses on web & mobile. You need this upgrade if your previous version ran on Mac OS X 10.13 High Sierra or OS 10.14 Mojave or previous and you upgraded to either 10.15 Catalina or 11 Big Sur. Apple changed the OS with Catalina which broke compatibility with all 32-bit apps, which gave us a lot of work. This is the same product as the Chess King 21 for Mac, simply you get a discount for being a prior Chess King user. To qualify for this offer, you need to provide your previous Chess King serial number. If you have a recent Chess King for Mac version (less than 2 years old), please send us your serial number and we'll check if you qualify for a free upgrade.
If you have any questions, please write to diego@chessking.com

Price: $34.95

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