The download took a while but it was successful, but when I click install it looks like it’s doing it and then a message appears that says “Unable to install update. An error occurred installing iOS 15.1”
Unable to install iOS 15.1 on iPhone 6s
How much free storage available ?
Repeated issues due to insufficient space:
https://developer.apple.com/forums/thread/683104
I got this error with 15.1 and i had around 4 GB of space left after downloading the update, i deleted some apps so i had 10GB available and then i could install the update.
Downloaded the new update and tried to install. I had about 4GB of space available after the download. I tried repeatedly to install the same but to no avail. I came upon this discussion and it was helpful. The post by AshishRajpal91 was the one to go with. I deleted a few apps and had about 6GB space and then tried again. I am now posting this reply post installation of ios 15. Have a nice day guys.