El capitan freeze during install

You can try stopping the MBP with the power button. Once it is stop for 20 seconds or so power it back up again and see if that helps.

i am having precisely the same proble,

Exactly the same problem on my late 2014 MacBook Pro Retina.

2nd time now trying to get the install to work, both times its frozen at 90% of the install on the plain white progress bar.

It won't restart in Safe Mode however I can get it to boot to recovery mode (which is the new El Capitan format) so the first time I restored from a backup.

I created a El Capitan boot USB stick using Yosemite and the El Capitan download.

Then I rebooted holding the "option" key to choose the boot disk. From here I deleted my hard drive (i have a time machine backup) then installed a clean El Capitan using the boot USB.

Then once finished I migrated my data using the time machine back up when the installation was complete.

All working fine now.

IF there is no Hardware problem:

Installing a new version of Mac OS X starts with a Restart. This boots up a stripped-down version of the new, incoming software. The Installer in that new software then unpacks and copies files, getting ready for the complete version of the new software. When all appears to be going well, it begins moving files into position to run the complete new version at the next Startup. If that goes well it moves temporary files to the Trash and Restarts. This entire process typically takes 10 to 30 minutes (not counting the download time).

If it dies early in the process, especially before copying files into position, the Install process is intended to leave your original System in place, unmodified. So you should see whether you can still boot the old System before you take desperate measures.

If it dies immediately after the first Restart, your Mac may not be compatible with the new System, the download could be damaged, or there may be a Hardware problem.

Worked! Thank you! Looking over many threads, it looks like you are absolutely right and the problem is a .kext

Thank you!
I have been having this trouble every time I tried to update since late 2013. I am so happy I can finally update my notebook without crossing fingers every single I try. Thanks again!

Thanks Denbee, I was facing this problem and it is solved now. But my question is, after moving back the .kext file one at a time, what happens when I find the bad .kext file? What to do with it? Should I delete this file or keep it in the unsupported folder?

Thanks Denbee for your reply. In fact, I have 13 .kext files. I copied all into the unsupported folder and then moved back each one, one at a time, followed by a restart for each copy-paste. However, I did not find any corrupted file, and I moved all 13 files with 13 restarts and it seems my computer is working fine after this. Now I have 13 .kext inside the unsupported folder and 13 copied one outside the folder. Not facing the screen frozen issue like before. Should I leave it like this for now? Hope Apple will release a patch quickly.

Thanks very much Denbee. My Mac Air was stuck at 90%, was upgrading from snowleopard so didnt know if this would work. In safe mode I couldn't see any kext files and could not use "Suspicious Packages" because finder wasnt working. So i just deleted my Firefox Web plug-ins in Terminal and the install proceeded fine. Thanks for directing me here!

Hi

I had a similar problem, tried rebooting in safe mode etc but not joy. I have disconnected all usb devices and something now seems to be happening. I will let you if the upgrade makes it through to the end