The potential issue with enabling 64-bit mode on your Mac is that you (or an otherwise 64-bit app) will end up needing to launch a 32-bit app for whatever reason and it will be unavailable. The good news is that this process is reversible, so if you run into the aforementioned situation, you can always switch back to supporting 32-bit apps. Apple provides a script that helps to port an existing 32-bit codebase to 64-bit. While it doesn't exactly convert (compiled) programs from 32-bit to 64-bit, it at least helps to convert the source.

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In this video we cover how to run Guild Wars, a 32-bit Windows application, on Wine for Mac OSX 10.15 Catalina which only supports 64-bit executables.Wineski.
Losing 32-bit app support is not totally unusual, as iOS abandoned 32-bit apps not too long ago, and it seems clear that Apple wants to do the same move to 64-bit only with MacOS as well. And for a little background, Mac OS itself has had 64-bit kernel support since Snow Leopard, so this is hardly a sudden shift in technology.

Quickly scan your disk for applications, see which ones are 32-bit, and find upgrade information with the click of a button.

Go64 makes it easy to plan for the future.

And yes, it's FREE!

Check to see which of your applications are already 'Universal Apps' and which ones still need to be upgraded. Universal apps contain the code necessary to run natively on both Intel and Apple Silicon processors, guaranteeing you get maximum performance from your new machine.

Are you running 32-bit apps that need to be upgraded? Go64 can help.

If you're running Mojave or High Sierra, you'll see an alert like this when you launch a 32-bit application. While it's not a crisis while you're still using the older OS, you'll need to update or upgrade those applications before you update to macOS 10.15 Catalina or macOS 11 Big Sur.

macOS 10.14 Mojave is the last version of macOS capable of running 32-bit applications. Once you've upgraded to a newer version of macOS, those apps will not launch! Go64 can locate all of your 32-bit apps so you don't get an unpleasant surprise after upgrading.

Exactly which apps stop working after Mojave and why?

Any app that's built with Apple's 32-bit software libraries will need to be updated so it will run in 64-bit mode. These are primarily older applications, but some newer specialty apps are also still 32-bit.

As Apple says, 'The technologies that define today's Mac experience—such as Metal graphics acceleration—work only with 64-bit apps. To ensure that the apps you purchase are as advanced as the Mac you run them on, all future Mac software will eventually be required to be 64-bit.'

Apple's support article explains how to use the built-in macOS System Report to identify 32-bit apps on your system.

However, once they've been identified, looking them up and locating the developers' contact information can be a painstaking process if you've got more than a few. In addition, the System Report doesn't account for apps that are themselves 64-bt, but that contain 32-bit plugins, frameworks or services. These apps may or may not run correctly on macOS 10.15 or 11.1. That's why we made Go64!

For more information on 32-bit apps and compatibility, see Apple's support information at https://support.apple.com/en-us/ht208436.

The current version of Go64 is 1.3. It will run on any version of macOS from 10.10 (Yosemite) to 11.1 (Big Sur). For full list of changes in each release, see the Go64 Change History.

For the real nit-pickers, here's a copy of the End User License Agreement.

To assist you in converting an existing application project to 64-bit, Apple provides a script that does most of the work. The script performs in-place substitutions on source-code files according to a set of rules. However, after you run the script you still need to look at everything that changed or was flagged and fix it if necessary. This procedure described below works as well for existing framework projects, plug-in projects, or other projects.

The Conversion Procedure

Start by eliminating the build warnings that your project currently generates; this will make it easier to focus on warnings that are specific to 64-bit conversion problems. Also save a copy of the project in case something goes wrong in the conversion process and you need to start over. Then in a Terminal shell run the conversion script ConvertCocoa64 located in /Developer/Extras/64BitConversion/. You can run the script on specific source and header files, as in this example:

Or you can run it on all .h and .m files in your project, as in this example:

As the script runs, it does the following things:

It converts most instances of int and unsigned int to NSInteger and NSUInteger, respectively. It doesn't convert ints in bit-field declarations and other inappropriate cases. During processing, the script refers to a hardcoded list of exceptions.
Important: The script converts instances of int and unsigned int that are properly the types of arguments and return values in POSIX calls. You must be aware of these instances and manually revert them (or leave them alone, if that is more appropriate).
It converts most instances of float to CGFloat, again leaving untouched those exceptions specified in a hardcoded list.
It does not convert enum declarations to types with guaranteed fixed sizes (as described in Enumeration Constants). You need to fix these declarations by hand.
It flags (with inline warnings) cases that need to be fixed manually. See Things to Look For During Conversion for details.

After the script completes processing all files, run the FileMerge development application on each changed file and an unchanged version of the same file. FileMerge visually highlights each modified section of code. After reading Things to Look For During Conversion, evaluate each of these sections plus the warnings generated by the script and make further changes if necessary.

Remember that any 64-bit change you make should help preserve binary compatibility of your project executable on 32-bit systems. You should use the constructs in Table 3-1 to mark off sections of code conditionally for each architecture: PowerPC versus Intel and 32-bit versus 64-bit.

**Table 3-1** Macros for architecture conditional code
Macro	Comment
`#if __LP64__`	PowerPC or Intel 64-bit. You should use this for most 64-bit changes.
`#ifdef __ppc__`	PowerPC 32-bit
`#ifdef __ppc64__`	PowerPC 64-bit
`#ifdef __i386__`	Intel 32-bit
`#ifdef __x86_64__`	Intel 64-bit
`#ifdef __BIG_ENDIAN__`	Big endian architectures

Things to Look For During Conversion

When the conversion script processes a source or header file, it often inserts warnings in the code to alert you to changes that you might have to make or pitfalls that you should try to avoid. These warnings are explained in the following sections.

Type Specifiers

Script action: Warns about potential problems; may generate false negatives.

Typically, in 32-bit code you use the %d specifier to format int values in functions

Convert 32-bit App To 64-bit Mac