Checkout and 64-bit
Checkout and 64-Bit Compatibility
When running Checkout 4 on High Sierra, MacOS 10.13 (or later) you may see a message indicating that Checkout is not optimized for your Mac because it is a 32 bit application.
As Apple says in the article linked to the message: "Yes, you may continue to use 32-bit apps with your Mac today. Using 32-bit software has no adverse effects on your data or your computer.” You will be able to use all build Versions of Checkout 4 on Mac OS High Sierra without any interruption.
While Checkout is currently a 32 bit application, we have been hard at work on a 64 bit version- Checkout Version 5. We fully expect our Checkout Version 5 to be compliant with all future MacOS releases and to be 64-bit in alignment with Apple’s timeline.
As with any new operating system, we recommend you don’t install the next version of MacOS until it is officially released (in other words, don't run beta versions/public preview releases) if Checkout is critical to your business. We will share our compatibility statement when we have fully tested Checkout against the new production version of the OS.