We have an iMac that is barely still compatible with El Capitan. Right now it runs Mountain Lion okay, and actually it has a smaller partition on the hard drive for another clean installation of Mountain Lion that we don't really use.
FIX This Copy of the Install OS X El Capitan Application Can’t be Verified. If the issue is with your Computer or a Laptop you should try using Restoro which can scan the repositories and replace corrupt and missing files. This works in most cases, where the issue is originated due to a system corruption. Jan 19, 2015 What gives? I can’t for the life of me change the date. If so, that means I can’t download El Capitan properly. I am here because of the “This copy of the Install OS X El Capitan application can’t be verified. It may have been corrupted or tampered with during downloading” message.
Question: Q: El Capitan installer cannot be verified I am trying to upgrade an older iMac (2008) from OS 10.6.8 to El Capitan for a disabled client who really needs to use a Mac instead of a PC! EveryMac says it can handle El Capitan if I upgrade RAM.
Feb 01, 2021 The links to download El Capitan and Yosemite will download the.dmg as advertised. I made the USB media and booted to it. Ran the installer, gets all the way to “less than a second remaining”, then errors out about not being verified, and that it could have been modified. Anyway, I am still unsure what caused all these problems (and we still haven't updated to El Capitan). I first thought it was the HD, but now I think maybe some other hardware problem. And maybe El Capitan could successfully be installed after I did the PRAM and NVRAM reset.
I have an El Capitan boot USB drive and an El Capitan install app, and I was thinking about using one of those to upgrade the clean install partition to El Capitan to see how it performs, but I'm hesitant and want to make sure things wouldn't be messed up.
So first of all, does this sound like a good idea? Second, would it be better to boot into the USB drive and choose to install to the clean install partition or should I put the install app on the clean install's Application's folder and run it from there?
El Capitan Cannot Be Verified Full
Also would doing this risk causing the Mountain Lion restore partition to be deleted? Are there risks of things being messed up, not being able to make Mountain Lion the default boot partition, or other weird things El Capitan would do to the main partition?