There are several indications that an application from the Mac App Store needs to be reinstalled. Telltale Signs that an App Needs to be Reinstalled If you want to reinstall an application that you downloaded from the App Store and then later deleted, this is the tutorial for you. The applications you download from the App Store can start to accumulate, and over time you may need to start deleting them. The Mac App Store is a good way to find applications for your Mac - maybe a little too good, in fact. How to Reinstall Apps from the Mac App Store.Read more about erase, macOS, mode, operating system, OS X, partition, recovery, reinstall.AirPort Apple Apps Backups Developer Education Email Hardware Internet iPad iPhone Mac Music Network Photos Security TV Weekend Wonk When the installation has finished the Mac should automatically restart itself and take you to its Setup Wizard which will ask you a series of questions to guide you through initial setup of your Mac. Click the Continue button and then follow the prompts to reinstall the Mac operating system.If your Mac is running macOS Sierra or newer then click on Reinstall macOS. Select your Wi-Fi menu and, if needed, enter the password needed to connect to this wireless network. Click on the Wi-Fi menu icon which appears in the upper right corner of the Mac’s screen.You’ll be returned to the main OS X Utilities window.When you have finished erasing the hard drive, click on the Disk Utility menu and select Quit Disk Utility.You will be warned that everything will be removed from the hard drive and that this is permanent. Click the Erase button and follow the prompts to erase the hard drive.It’ll be listed in the left-hand side of the Disk Utility window. Typically the hard drive is named Macintosh HD but yours could have a different name. Click on your Mac’s internal hard drive.Click on Disk Utility and then click the Continue button.When the Mac has completed its startup, you should see a window similar this one:.Your Mac is now starting up in Recovery Mode. Once you see the Apple logo appear in the middle of the screen you can release the Command and R keys.

This instructs the computer to startup from the Recovery Partition.

Turn on the Mac and immediately press and hold down both the Command key and the R key.

How to reinstall mac pro