If you’re trying to update or install apps but the update refuses to start or you have stuck downloads in the Mac App Store, then try the following fixes. Cancel and restart. If you have stuck downloads in the Mac App Store or updates that won’t start, cancel them and try starting them again. Often, this will be enough to fix the problem. Bitdefender has a paid version, yes, but this version is not the one that costs money, this version is 100% FREE! “Bitdefender Virus Scanner”, the thing you see here, is the free one. “Bitdefender Antivirus for Mac” (from their website) and “Bitdefender Virus Scanner Plus” (from the Mac App Store) both cost money.

• App Won't Install Mac Catalina
• App Won T Install Kindle Fire
• Mac Update Won't Install
• Mac Apps Won't Open

Installing software on a Mac is different from installing software on Windows. So for NoxPlayer. The first time you install and start Nox on your Mac, you may need to do the following to assure its proper running, which fixes the issue of stucking at 99%. Here is the tutorial as follows:

First Method

The first time you open NoxPlayer (or any downloaded application), you’ll see a warning. Agree to open the file and you won’t see the warning again. We suggest that you also tick the “Don’t warn me when opening application on this disk image” box.

Second Method

3. You may also see the below warning when you start Mac version the first time. Here we assure you that Nox for Mac is a safe software you could trust. and please follow these steps:

• Open the System Preferences window
• Click the Apple icon at the top-left corner of your screen or click the System Preferences icon on your dock
• Click the Security & Privacy icon.
• Click the lock icon, enter your password, and set the “Allow apps downloaded from” option to “Anywhere.” Or click the “Open Anyway” button to bypass Gatekeeper in Mac.

Fourth Method

4. And if your mac verison is macOS Sierra, please click the “Allow” button in Security & Privacy to bypass Gatekeeper in Mac.

Fifth Method

• Shut down NoxPlayer and delete “Virtual Box” in Applications
• Visit /Applications/NoxAppPlayer.app/Contents/MacOS → Double click Nox.app →Enter password

• Click System Preferences → Security & Privacy → General → Click the “Allow” button

macOS Catalina gives you more of everything you love about Mac. Experience music, TV, and podcasts in three all-new Mac apps. Enjoy your favorite iPad apps now on your Mac. Extend your workspace and expand your creativity with iPad and Apple Pencil. And discover smart new features in the apps you use every day. Now you can take everything you do above and beyond.

Check compatibility

If you're using one of these computers with OS X Mavericks or later,* you can install macOS Catalina. Your Mac also needs at least 4GB of memory and 12.5GB of available storage space, or up to 18.5GB of storage space when upgrading from OS X Yosemite or earlier.

MacBook introduced in 2015 or later
MacBook Air introduced in 2012 or later
MacBook Pro introduced in 2012 or later
Mac mini introduced in 2012 or later
iMac introduced in 2012 or later
iMac Pro (all models)
Mac Pro introduced in 2013 or later

* To upgrade from Lion or Mountain Lion, first upgrade to El Capitan, then upgrade to Catalina. To find your macOS version, Mac model, memory, and storage space, choose About This Mac from the Apple menu . If your Mac isn't compatible with macOS Catalina, the installer will let you know. View the complete list of compatible computers.

Make a backup

Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.

Get connected

App Won't Install Mac Catalina

It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.

Download macOS Catalina

If you're using macOS Mojave, get macOS Catalina via Software Update: Choose Apple menu  > System Preferences, then click Software Update.

Or use this link to open the macOS Catalina page on the App Store: Get macOS Catalina. Then click the Get button or iCloud download icon.

App Won T Install Kindle Fire

Begin installation

After downloading, the installer opens automatically.

Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.

If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.

Allow installation to complete

Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.

Stay up to date

Mac Update Won't Install

After installing macOS Catalina, you will be notified when updates to macOS Catalina are available. You can also use Software Update to check for updates: Choose Apple menu  > System Preferences, then click Software Update.

Or get macOS Catalina automatically

If you're using OS X El Capitan v10.11.5 or later and your App Store preferences or Software Update preferences are set to download new updates when available, macOS Catalina will download conveniently in the background, making it even easier to upgrade. A notification will inform you when macOS Catalina is ready to be installed. Click Install to get started, or dismiss the notification to install later. When you're ready to install, just open the file named Install macOS Catalina from your Applications folder.

Learn more

Mac Apps Won't Open

• If the installer shows a list of apps that are not optimized for your Mac, learn about 32-bit app compatibility, then choose whether to proceed with the installation.
• For the strongest security and latest features, upgrade to macOS Catalina. If you have hardware or software that isn't compatible with Catalina, you might be able to install an earlier macOS, such as Mojave, High Sierra, Sierra, or El Capitan.
• You can also use macOS Recovery to reinstall macOS.