How to Fix “An Error Occurred Installing iOS 15” issue?

BY Sourav



The iOS 15 update is packed with new amazing features like Redesigned Notifications, using Face ID with Mask, Live Text, Mail Privacy Protection, and other developments and bug fixes. However, many users have reported being unable to install iOS 15 on their iPad or iPhone. While selecting the Download and Install option, they’re receiving an error: “Unable to Upgrade. An error occurred installing iOS 15 on your iPhone or iPad. Retry/Remind Me Later.”

If you want to solve this problem, here’s the guide explaining how to fix “An error occurred installing iOS 15” on iPhone or iPad.

What Causes An Error Occured Installing iOS 15 and How to Fix it?

There could be many reasons behind receiving the error message on iPhone or iPad that says, “An error occurred installing iOS 15”. Unfortunately, the source of this error is indefinite, but there’re some ways to remove this bug.

Here’re the ways to fix the error and update the iOS device to its latest version.

Fix 1. Delete and Install the iOS 15 Update Again

The first fix you can try is to delete or uninstall the iOS 15 update entirely from your iPad or iPhone and reinstall the new OS update again. Here’re the steps:

  • Open Settings on your iOS device.
  • Select General > iPhone Storage.
  • Look for the iOS update in the given list, tap it and select Delete Update.
  • Restart your device.
  • Now, again go to Settings > General and tap Software Update.
  • Download the latest iOS update.

After deleting the old iOS installer and then downloading the latest iOS, you will be able to download and install the iOS 15 update smoothly.

Fix 2. Force Restart Your Device

When you force restart your device, it helps all the processes close and start operating again. After performing a hard reset, this can often remove any glitches or bugs causing the error. Here’s how to do it:

  • In order to restart an iPhone, press and hold its Home button and Power/Standby button together for 10-12 seconds.
  • To force restart iPhone 7, press and hold the Volume down button and Sleep/Wake button simultaneously. Once the Apple logo shows up, release the buttons.
  • To force restart an iPhone with Face ID, press and immediately release the Volume up button, press and immediately release the Volume down button and press and hold the side button. Once the Apple logo shows up, release the buttons.
  • To force restart the iPhone 6s or iPhone SE (1st generation), press and hold the Sleep/Wake button and the Home button simultaneously till the Apple logo shows up, and then release them.

Fix 3. Free Up Space

It is verified the new iOS 15 update size is large, approximately 5gb-6gb based on your device model. Insufficient internal storage may lead to the “Unable to Install Update. An error occurred installing iOS 15″ error. So, it’s recommended that you must have enough free space to install the latest Apple OS update.

Follow these steps below to check for available storage space:

  • Go to Settings > General > About.
  • Scroll down and check the free storage space, showing in GB.
  • In case the space is low on your iPhone or iPad, delete some unused apps, messages, and big files like photos, videos, audio, etc.
  • Also, you can do this, open Settings > General > iPhone/iPad Storage and delete downloaded iOS 15 files.

Fix 4. Reset the Network Settings

There are possibilities that network settings on your iOS device are the reason for the “Unable to Install Update. An error occurred installing the iOS 15″ problem. So, reset the network settings and ensure your mobile network is on. To reset network settings, open Settings > General, and under the Reset tab, select Reset Network Settings.

Fix 5. Turn Off Restrictions

Another possibility you’re unable to install iOS updates on the iPad or iPhone is there’re some restrictions on your device preventing it. Try turning off the Content and Privacy Restrictions and see the result.

  • Open Settings from your home screen.
  • Tap Screen Time.
  • Toggle off the switch beside Content & Privacy Restrictions.
  • Next, navigate to Settings > General > Software Update and download and install the iOS 15 update.

Fix 6. Install iOS 15 Update from iTunes

If you’re still unable to install the latest Apple OS, try updating the device from iTunes. However, installing iOS 15 updates with iTunes is more difficult than doing it directly with the iPhone.

Here’s the process to download and install the iOS 15 update from iTunes on iPhone:

  •  Connect your device to the PC using a USB, USB-C cable, or WiFi.
  • Form the iTunes application on your PC, and select the Device button at the upper left of the iTunes screen.
  • Click Summary > Check for Update.
  • Select Update to download and install the iOS 15.


These are the top six ways you can apply to fix “An error occurred installing iOS 15” on your iPhone and iPad. If this guide is helpful to you, please share it. And if you know any better solutions, tell us in the comment box below.

About The Author


Sourav’s been working as a freelance writer and blogger for over five years. She is a firm believer in big dreams and realizing them. Her work has been published in Women On Writing, Be a Freelance Blogger, Make a Living Writing and Brazen Careerist among others

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