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Mac users running the recently released macOS 10.13.4 update may see a new alert message when they log in and launch apps this morning, as Apple begins keeping its WWDC promise to push developers to upgrade their apps to 64-bit. What is this alert? Starting around midnight local time April 11 and 12, Macs running the latest OS version begin offering up a warning message the first time their users launched a 32-bit application.

Apple 32-bit app alerts are coming to macOS 10.13.4. The warning states that the app is not “optimized for your Mac” and lets you know that it needs to be updated by the developer to improve compatibility. The warning will appear only once — the first time you open the app. It will also include a link to an that explains a little more about why it is there. [ Further reading: ] Why am I seeing this message? There’s no immediate reason to worry.

Apple warned us of its plans to let macOS High Sierra users know when we are using 32-bit apps, but it waited until now to begin doing so. Apple already demands that all new apps submitted to the Mac App Store be 64-bit, and from June 1 will insist that any software updates submitted to existing apps should also be 64-bit. The pressure has been there for some time. The company has been engaged in the transition to 64-bit for over a decade.

The first Mac to appear with a 64-bit chip inside was the G5 PowerMac. Since then, the company has managed to ensure both its mobile and its Mac platforms run on 64-bit chips. [ ] Apple has previously said that macOS High Sierra will be the last version of the Mac operating system to run 32-bit apps 'without compromise.' Does this mean my 32-bit apps won’t work? Short answer: No.

Nothing has changed. Apple is not going to switch off 32-bit app support on your Mac. Those apps will still work fine, and your data will be safe. Final transition dates — also known as when Apple will switch off 32-bit app support on Macs — have not yet been set, though you may find that in the future the experience of using 32-bit apps will become more compromised. Will 32-bit apps work on the next OS version?

Yes, 32-bit apps will work on macOS 10.14, but do hassle your developers to update them. You see, I’ve learned that while Apple hasn’t fully defined to what extent 32-bit apps will be compromised when running on the next OS, it seems likely their use won’t be quite as straightforward. I will note that in previous OS transitions, users have had to download additional software resources to make things work. Apple will still support these older apps — though they will be unable to fully exploit powerful system features, such as the, which is 64-bit only. The bottom line? Their days are numbered.