Why has Apple decided to block 32bit apps in next version of the OS.?

How do I upgrade to the first version of Acrobat which Apple support?


I'm currently using Acrobat Pro 8. Very happy with it.

Posted on Jan 6, 2020 6:48 PM

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13 replies

Jan 6, 2020 7:08 PM in response to WayneAu

I don't think that they are blocking anything -- they simply have decided to not port the 32-bit based libraries, frameworks, and other underlying infrastructure necessary -- that would involve a lot of work I would guess, and they simply decided it was time to cut the 32-bit cord. They've been talking about this for years and finally have done it.


Good luck...

Jan 6, 2020 8:53 PM in response to WayneAu

WayneAu wrote:

Unfortunately I don't have access to the source code or have an assembler debugger any more.

It wouldn't matter. There's nothing to find

But using deductive logic - the apps worked in 10.14.4, my MBP is 64 bit and ran the apps without error, although Apple did put in a warning 32 bit apps will not work in the next version of the OS.

OSX/macOS has been 64bit for about 12 years. 32 bit apps only continued to work because Apple was supporting them all these years. I think Sherlock Holmes' job is secure. :)

In marketing there is golden rule, evolve or renew your market every 5-7 years or die. Who can remember Lotus123?

Again, the Mac OS has been 64bit for over 12 years. Based on the "5-7 years" rule. They were long overdue.

Jan 6, 2020 7:10 PM in response to dialabrain

Unfortunately I don't have access to the source code or have an assembler debugger any more.


But using deductive logic - the apps worked in 10.14.4, my MBP is 64 bit and ran the apps without error, although Apple did put in a warning 32 bit apps will not work in the next version of the OS.


In marketing there is golden rule, evolve or renew your market every 5-7 years or die. Who can remember Lotus123?


Jan 6, 2020 7:40 PM in response to WayneAu

I would like to offer several important points for you and any of our other viewers concerning the ‘problems’ with Microsoft Office after an OS upgrade to Catalina.

·      First, Apple has regularly informed all of us for a couple of years that at some point our old 32 bit programs would no longer work with a future OS upgrade. That has finally occurred as we have been told it would. This appears to be the case with you. The message announcements were received when an older 32 bit program was opened.

·      Any other old 32 bit programs you have installed will also be affected. They also will no longer work and must be upgraded or replaced with 64 bit apps.

·     If a person wishes not to upgrade their Microsoft Office, there are several good alternatives. They are the free LibreOffice and OpenOffice apps. Additionally, your Apple OS provides three free programs which you may use as an alternative to Office, Pages, Numbers and Keynote.

·      Any of these apps can and will open your Office documents. You may also create new documents and save them as Word files, etc. when you need to share files with other people who only have Office installed.

·      You should be aware that using these other apps to open Word documents will result in formatting changes.

·      Using any of these programs does involve a learning curve as they work a bit differently, but all of them are fine programs.

If you have Microsoft Office for Mac 2016 or later, it can be upgraded at no cost. If it is an earlier version, it cannot.

·      If you decide to upgrade an older version of Office, you have options. You may elect to subscribe to any of the following:

    • Office 365 Home:         $99.99 per year or $9.99 monthly. This allows you to install Office in up to six devices. This service must be renewed yearly. You may try the service free for one month.
    • Office Personal:           $69.99 per year or $6.99 monthly. This is for installation on one device only. This service must be renewed yearly. You may try the service free for one month.
    • Office Home & Student:        $149.99 one-time purchase cost. This is a purchasefor installation on one device only and is not renewed or have a monthly fee. It does not expire.
    • The second and third options include fewer additional apps such as having no Outlook app. Check the Microsoft site for details.

·       I strongly recommend that if you elect to do the Office upgrade, you first completely remove your Old Office app and its associated bits and pieces which will be spread through several other folders. This can be done effectively with the free program AppCleaner.app. It is easy to use and doing so will avoid creating any potential conflicts. After this is done, then you may download the replacement Microsoft Office files safely.

·       Finally, and this is important, when purchasing any of these Office upgrades, you need to register your purchase on the Microsoft web site, including which device or devices the apps are installed on. This can be changed later if a device is replaced. You must do this registration or you can have problems.

In summary, Apple has warned us of the change to 64 bit operations only. It has occurred. Now, it is up to us to decide how to respond. I hope this information is helpful to you. Good luck


Jan 7, 2020 3:15 AM in response to dialabrain

My point exactly, 12 years of 64 bit OS no problem running 32 bit apps in the 64 bit environment for 12 years. Thus 32 bit apps could run for another 12 years, unless a bit of code has been changed to check for 32 bits. This is confirmed by Apple's 32 bit warning in 10.14.4. The current situation has nothing to do with Apple not supporting 32 bit apps, it is a commercial business decision implemented in software. A decision more in keeping with Shylock than Sherlock.


All excuses for ceasing '32 bit support' are rhetoric to justify the blocking.


Many thanks Ronasara for your advice, but my 32 bit apps aren't related to Microsoft products. They are all Apple & Adobe apps which do what I want as they are. Unfortunately the next OS version blocks their execution. Thus upgrading past 10.14.4 is as far as can go unless I spend $k's on upgrading these apps to their 64 bit versions.



Jan 6, 2020 6:59 PM in response to dialabrain

There is a difference between not supporting and ensuring they will not function. Smaller word sized applications run fast in larger word sized OS, unless they are blocked. If the OS was still using Motorola CPUs I could understand as the stack sizing is more dynamic. As the OS is now using Intel where the registers are hardwired smaller words apps simple run faster.

Jan 7, 2020 3:36 AM in response to WayneAu

I guess you must think the 32bit support code still exists somewhere in Catalina and Apple continues to revise it to work in a 64bit environment in each version of macOS but then adds code to block 32bit apps from running. I guess you must think Apple continues to write PowerPC support aka Rosetta but has been blocking it as well. Very logical. 😎

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Why has Apple decided to block 32bit apps in next version of the OS.?

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