Quit Acrobat or Acrobat Reader if it's already running.
On Windows only
Acrobat or Acrobat Reader is unable to search or find text in a PDF using the Find or Advanced Search tool.
Update your Acrobat and Acrobat Reader. The latest patch release (21.001.20142) has the fix for this problem. To update from within the product, open Acrobat or Acrobat Reader, and go to Help > Check for updates.
In case you are still facing issues, try Solution 2 below.
Applicable on Windows (32-bit)
Update your Acrobat and Acrobat Reader to 21.001.20142 or higher version, and then try the steps below.
Quit Acrobat or Acrobat Reader if it's already running.
Open the Registry Editor: Go to Run (Windows menu + R), type regedit.exe in the Open field, and then click OK.
In the Registry Editor, create the following key:
Path: HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Adobe\Adobe Acrobat\DC\FeatureState
Key: bFallbackOnix32
Type: REG_DWORD
Value: 1
Path: HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Adobe\Acrobat Reader\DC\FeatureState
Key: bFallbackOnix32
Type: REG_DWORD
Value: 1
Close the Registry Editor.
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