Certificates get corrupted after updating Acrobat or Acrobat Reader Trusted Certificate Store

Update to the latest version: In Acrobat or Reader, go to Help > Check for Updates, and then the follow onscreen instructions.

Update AATL/EUTL: In Acrobat or Reader, go to Edit > Preferences and then do the following:

• For AATL: Under Categories, select Trust Manager and then select the Load trusted certificates from an Adobe AATL server check box and click Update Now.
• For EUTL: Under Categories, select Trust Manager and then select the Load trusted certificates from an Adobe EUTL server check box and click Update Now.

Update to the latest version: In Acrobat or Reader, go to Help > Check for Updates, and then the follow onscreen instructions.

Close Acrobat or Reader if it's running.

Delete the trust list by deleting the following file:

C:\Users\[UserName]\AppData\Roaming\Acrobat\<product version, for example, DC, 2015, or 2017>\Security\addressbook.acrodata

Re-create trust list file (addressbook.acrodata) by updating AATL, EUTL as described above - step 2 in the previous procedure.

Manually add the certificate that you want to trust to the Trust Identities.

To add a certificate manually to the Trusted Identities:
1. Go to Edit > Preferences.
2. Under Categories, select Signatures.
3. For Identities & Trusted Certificates, click More.
4. Select Digital IDs on the left.
5. To import an ID, click the Add ID button, and then follow the onscreen instructions.