Apple recently issued a reminder to macOS users，New macOS versions will no longer be compatible with 32-bit apps。When users enable 32-bit apps on macOS High Sierra 10.13.4，The system will pop up a prompt："This app needs to be updated by its developer to improve compatibility。”
Due to software update issues，There are still some 32-bit applications on many Macs，These apps will be unavailable after future system upgrades。Here's how to find out if your Mac software is 32-bit or 64-bit：
How to check if your Mac software is 32-bit or 64-bit
The easiest way to see all 32-bit and 64-bit applications on your Mac is to use System Information：
1. Press and hold on the keyboardOption / Altkey，Then click on the Apple menu。
2.Select "System Information" from the top of the Apple menu list。
3.In the System Information application，Scroll down left menu，Then look under "Software" and select "Applications"。
4.Look for the "64-bit (Intel)" option in the column headers。This column will show the number of bits in the application。
