Once again – if you’re a novice Mac user, you probably don’t need to test 64-bit compatibility. Most 32-bit apps already start up with a warning message (see image below), and for many users this is sufficient to know which apps might have issues in the future.Įnabling 64-bit Mode in macOS 10.13.4 or later This test involves using Terminal and a command-line instruction, so if you’re not comfortable with using Terminal - or if you really have no reason to check 64-bit compatibility - you may want to avoid doing this. One easy way to do this is to set up a Mac running macOS 10.13.4 High Sierra or later in 64-bit mode to see what’s compatible and what isn’t. This Mac tip can be used to enable 64-bit mode on a Mac for testing, then shift back to the ability to run 32-bit apps and other software components. While most casual Mac users may not see a difference in day-to-day work, those who are advanced Mac users or system administrators may wish to know what apps could need updating. Starting on June 4, 2018, all Mac apps and updates to existing apps must support 64-bit mode. Usually the kernel won't need that much address space (it can manage around 32 GB of RAM for other apps).Since the 2017 Apple World Wide Developers Conference, it’s been well-known that Apple will require all developers to submit only 64-bit apps to the Mac App Store. The limitations of booting into a 32-bit kernel are that the kernel itself can't access more than 4GB of RAM, and it can't use 64-bit kernel extensions. VMware Fusion's 32-bit install mode installs 32-bit EFI which is not possible to boot into 64-bit kernel.Īs far as I know, 64-bit programs will run just fine on the 32-bit kernel. But it is possible to use a 3rd party "32- or 64-bit Kernel Startup Mode Selector" to set 64-bit kernel boot mode and 64-bit kernel (System Profiler > Software > reports 64-bit Kernel and Extensions: Yes). VMware Fusion's 64-bit install mode installs 64-bit EFI which by default boots into 32-bit kernel. I wonder when the current certificates will expire again. It seems Apple has not unpdated all installers because even freshly downloaded earlier Combos failed. The certificates of my old archived installers had expired.Ī fresh copy of Mac OS X Server v10.6.8 Update Combo v1.1 could update 10.6.3, and after installing Security Update 2013-004 Server (Snow Leopard) or Apple Software Installer Update 1.0, then VMware Tools and all other off-line installers worked OK. I could bypass that by installing Software Installer Update 1.0 via Pacifist (it refused to install because it needed 10.6.8) - after that all installers including the 10.6.8 Update Combo installed OK.Īnother more laborious way was to install Mac OS X Server v10.6.6 Update Combo, Mac OS X Server v10.6.7 Update, Mac OS X Server v10.6.8 Update v1.1 and Security Update 2013-004 Server - after that all installers including VMware Tools installed OK. I could update freshly installed Mac OS X 10.6.3 Server to 10.6.8 via the online Software update control panel just fine.īut many old off-line installers and VMware Tools failed to install due to "installer error". Both 32-bit and 64-bit installs ran OK.ĭon't 32-bit applications run on 32&64-bit systems while 64-bit apps need a 64-bit system? As far as I remember, I could boot Mac mini Late 2009 in either 32- or 64-bit OS X 10.11 (I tested that when Cisco's VPN client didn't work in 64-bit boot anymore but luckily the built-in VPN was very good. dmg updates in case the software update does not work in the future. I have an old Mac OS X 10.6.8 virtual machine on VMware 11 and in the past few days I have tested if I can still make a fresh install in Mojave. A recent MacInTouch thread mentioned OS X 10.8 and 10.11 as other good candidates. I might use Mac OS X Server v10.6.8 because as a bonus it is the last system that can run PowerPC applications via its Rosetta emulation. I am experimenting which old Mac OS X version is the best to virtualise 32-bit apps in Catalina in the future (I'm currently using Mojave).
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