File not found: "TurboActvate.x64.dll"

My VBA application has been working perfectly for years.  Two weeks ago, my application stopped working due to old DLLs. I had to rebuild and redistribute because of extra measures I took to prevent DLL substitution - I could not just plop in the new DLLs.

In my application I put the TurboActivate DLLs and DAT file in the same folder as the running program, a VBA Macro Excel spreadsheet. I call the standard helper function GetTADirectory()  with the GetTADirectory = Application.ThisWorkbook.Path command to get the TA directory.

My new build is working good and my 60+ customers are all up and running except one.  This customer gets a File not found: "TurboActvate.x64.dll" error every time they start the program.

I have spent the last three days troubleshooting this problem and cannot fix it.  

Here is what I've done so far.

  1. Verified their installation is correct.
  2. Verified that Excel Macros are enabled.
  3. IT department gave the user local admin rights.
  4. Verified that the TA files are not blocked by right clicking on the file, selecting properties, and checking Unblock.

I don't believe this is a TA issue. I am reaching out to see if anyone else has encountered this problem and has any advice I suspect it might be a security configuration or group policy issue. Any help is appreciated.

Thanks.