Adobe Reader doesn't patch to 18.0.11.20040 but stays at 15.7; how can I fix this?

According to the procedure we have used for the last several distribute versions we should do.

We download the Enterprise version of Adobe Reader; we then extract the .exe using a command prompt line:

Adobe Acrobat Reader DC 2018.011.20040.exe -nos_oC:\AdobeFiles -nos_ne

Doing this gives us an MSI file, allowing us to deploy Acrobat Reader via Group Policy. The MSI file is version 15.7 - the MSP file (in this case "AcroRdrDCUpd1801120040.msp" is supposed to patch the MSI file up to the current version. The patching is done by doing the following:

• Then in Admin Command prompt:
  • Msiexec /a [File].msi (EX: msiexec /a AcroRead.msi)
    • Create Adobe folder on desktop and install to location
• In the install folder (navigate there in command prompt)
  • Msiexec /a Acroread.msi /p [[install path to the patch]]
    • (EX: msiexec /a AcroRead.msi /p c:\AdobeFiles\AcroRdrDCUpd1801120036.msp)
    • Install patch to Adobe folder on desktop

The above should patch the MSI to 18.011.20040 but according to Group Policy it is still 15.7 and shows it when I restart, it's that version of Adobe Reader. Is something wrong with the distribution file?