The software that ran on these computers was also 32-bit. Here is an explanation about the difference and why Apple is doing this.ģ2-bit processors and 32-bit operating systems were used in all computers (Mac & PC) until the early 1990s. This transition has been a long time coming and most current software complies. With the upgrade, Apple has finally pulled the plug on older '32-bit' apps, requiring all software (apps) you run to be 64-bit. Apple has released the next Mac OS Catalina (10.15) in early October.
