Unable to install PDF printer | Certificate was revoked or port is unknown

Open Print Management: Press Windows + R keys to open the Run command dialog box, type printmanagement.msc in the Open field, and then click OK.

In the Print Management dialog's left navigation bar, click Print Servers > [User's computer name] > Printers.

From the list of printers, remove all Adobe PDF entries: Right-click Adobe PDF and then click Delete.

Click Drivers in the left navigation bar. Under Driver Name, right-click Adobe PDF Converter and click Delete.

Remove all the Adobe PDF Printer Driver related files. Do the following:

1. Open command prompt as an administrator: Press Windows + S and type cmd. Right-click Command Prompt and choose Run as administrator.
   
2. Type the following command and press Enter: dism /online /get-drivers /format:table
   
3. Find all Adobe drivers still available in the list:

   d. Type the following command and press Enter:

   pnputil -d <oemXX>.inf

      Where XX is the number associated with the Published Name of the adobepdf.inf file.
      (For example, in the screenshot above, the published name of the adobepdf.inf file is oem10.inf).

One-by-one, run the same command for all adobepdf.inf entries in the table.

Close the command prompt - type Exit and press Enter.

Download the PDF drivers from below - click Get File.

Unzip the downloaded AdobePDF.zip file. It creates a folder named AdobePDF that contains the drivers.

Copy the AdobePDF folder and paste it in the following location, confirm to replace or overwrite all the files in the folder:

C:\Program Files (x86)\Adobe\Acrobat <version>\Acrobat\Xtras

Where <version> represents the version the Acrobat installed on your computer, such as DC, 2017, or 2020.

Download the utility from below - click Get File.

Unzip the downloaded CreateAdobePDFPrinter.zip file. It creates a folder named CreateAdobePDFPrinter that contains the following utilities:

• CreatePDFPrinterUtilityx64.exe: It's for 64-bit Windows. 
  
• CreatePDFPrinterUtilityx86.exe: It's for 32-bit Windows. 
  

Based on whether you have 32-bit or 64-bit Windows, double-click the corresponding utility. The following prompt is displayed. Click Yes.

The utility takes a few minutes to add the PDF printer.  Once it's done, the following confirmation dialog box is displayed.

Click OK.