Re: Aspire S3-391 won't suspend/shutdown with any OS

The only things I can suggest......

1.  Start over.  Backup your important personal files and wipe your drives with "diskpart clean" and try to get a fresh start.

2.  Or completely start over.  Wipe your drives with "diskpart clean" and......

http://us-store.acer.com/erecovery/rcd/

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The link below has numerous links with some tips and tricks on how to start over and clean install vanilla Windows 8.1 or TH1, TH2, Redstone1 versions of Windows 10 with rufus in default UEFI mode.

http://community.acer.com/t5/V-and-VN-Series-Laptops/V3-772-Windows-10-upgrade-fail-wont-boot-just-hangs-with-the/m-p/460691

I'm not sure why you were trying to use that Intel Management Engine interface driver as the topic was about someone with Haswell-ULT.  

If I were desperate, I would look at this Intel MEI if I had third gen.

I'm also not sure why your computer didn't make the list for the original release of Windows 10 or Anniversary.

http://www.acer.com/ac/en/US/content/windows10-eligible-models

http://www.acer.com/ac/en/US/content/windows10-update

Regarding your 20 GB hibernation drive........maybe it's not configured properly.  It's my understanding that your 20 GB hibernation drive must be configured in a special manner when you're not using the original factory OEM OS.  (See video below).  Not sure if the links below apply to you or will help.

http://acer.custhelp.com/app/answers/detail/a_id/30001#_ga=1.15172022.1224133495.1476730983

http://community.acer.com/t5/S-and-R-Series-Laptops/Acer-S3-ultrabook-with-20GB-SSD-Can-t-reload-Windows-10-on-new/td-p/444076

I don't have any more suggestions.  Good luck.  Maybe someone else can help.