After you upgrade to Internet Explorer (IE) 11, the ZD decryption for encrypted email attachment fails. The following error message appears:
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Fix connection problems
The issue is caused by ppZDHelper.dll, which has the add-on name of AesDecryption Class. When your default browser is IE and the add-on item is enabled, the ZD decryption runs via ppZDHelper.dll. The ppZDHelper.dll extracts the decrypted attachment to a temporary folder and notifies IE to open the file.
After updating to IE 11, the temporary folder for ppZDHelper.dll is changed. The ppZDHelper.dll will not be able to access the new temporary folder, thus, IE will fail to open the file.
As a workaround: