Adobe Reader not opening after June 2023 Windows Patch update KB5027215

Suspect the firewall....I spent the most part of a weekend swapping system images after trialing endless combinations of software.
In my case the snail pace OS resulting from KB5027215 and later updates... was a punchup between Win10 and zonealarm. My firewall is now freeby TinyWall and the applications, browsers etc are fast loading and running like a rocket. The newer version Zonealarm repaired the slowing of apps, but, introduced problems when loading my more archaic programs. I found tinywall co-existed happily with win10, and, empiricaly seems to be smoother and faster than the newer zonalarm (and more user friendly)
AMD Ryzen 7 5700G with Radeon Graphics 3.80 GHz
Windows 10 Pro 22H2 19045.3208

Disabling protected mode fixed it for us.

In the registry browse to the following key:

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Adobe Acrobat\DC\FeatureLockDown

Now add new D-Word 32 bit > bProtectedMode

Change value to: 0

Worth remembering this will lower the security, but without doing this Adobe Acrobat simply just won't work for us.

Hi Fiona30766309m0xx,

The team is still working on the fix. 

Could you please confirm if you are using FireEye? If yes, please try updating it to the 35.31.25 version.

Let us know how it goes.

Thanks,

Meenakshi

Hi @Fiona30766309m0xx 

Thanks for reporting this to us.

We have had this issue reported by a couple of more users. This is already escalated to the engineering team, and a bug has been logged. 

The team is working on the fix, and as soon as we get an update, we will let you know.

Sorry for the inconvenience caused.

Meanwhile, give it a try by doing a clean install for the app. 

Run this cleaner tool to remove the existing installer and application’s file traces:

https://www.adobe.com/devnet-docs/acrobatetk/tools/Labs/cleaner.html

Download the Acrobat Reader installer from here:

https://get.adobe.com/reader/enterprise/

Or

https://helpx.adobe.com/reader/get-started.html

Thanks,

Akanhcha