Did you know macOS 15 Sequoia changes the Mac Address of a computer, which can cause apps previously purchased from the Mac App Store to suddenly no longer open?
If you’re still using Xojo, I’ve updated my OWStoreKitBridge code to workaround it.
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I’m stunned anything would have relied on MAC addresses
Most network cards & stacks let you change that from software for ages & so MAC address was NOT a good stable identifier to use for things
Enterprise Networks and Firewalls rely on MAC Adresses, any change and you are kicked out…
For sure this will create a lot of Support troubles in Enterprise networks.
Apple has no interests in this problems. They do and customers have to suffer. That’s it. Simple. The entire point is on apples site. Nobody can do anything. They have done something like this already with the mouse events so a few CAD vendors had to re-develop their software. That’s APPLE. I had some reasons to change back to Linux and use Mac only for the platform dependent builds and tests. It is dangerous to rely on this platform.
Okay, to speak real truths: it is a security question. To change the exposed Mac address helps not being hacked. That’s the simple thing behind. And this feature is needed while the risk is climbing up. For everybody. And Software Vendors which are not reacting on this will have a real problem. Cause this Mac adress use is not correct. It is not there for licensing anything. It is there for identification the device in the connected network. And while this causes so many, many risks it is healthy not to expose this Mac address and to use virtual ones. Apple reacted here in the right way. Reading the changes for the OS will help. Even the ones thinking that this is the best way. IT IS NOT. Using Mac address for licensing is like giving a thief your house door keys. You may think it is without risk. It is definitely not. Therefore: change your licensing if it relies on Mac address. Thanks apple.
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MAC address on macOS on a Mac is enough mac’s where this entire thread was confusing at the start.
Regardless, I just realized why I’ve always had a problem licensing software. I rotate my MAC addresses. I’ve been doing this for over a decade.
Ooops. 
Apple use it to generate the receipt, but with almost every way I know to get the MAC address, it fails.
I had to translate some code from Cyber Duck which uses IOKit to read the MAC address, and thankfully that matches the MAC address Apple used to generate the receipt.
crazy since its so easy to alter one but …
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Related to the receipt processing in macOS 15.
https://mjtsai.com/blog/2024/10/18/exit173-receipt-fetching-deprecated-on-sequoia/
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Mac is sometimes crazy to work with. But needed. So everybody has to handle errors like this. Tks for this informative link.
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oh thats just, WTF apple?
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