Symptoms

When you install FineReader Engine on a machine where the previous build has been installed, you might face the exception "The path is not of a legal form".

Cause

This issue may occur because the old build was not completely removed before installation.

Resolution

There are a few steps to fix this:

1. Check and remove all unnecessary entities from registry Computer\HKEY_CURRENT_USER\SOFTWARE\ABBYY\SDK\12\Installations\
2. Unregister FREngine.dll manually using the following command:
   

   regsvr32.exe /u "<path to FREngine.dll>"

   And register it once again with:

   regsvr32 /s /n /i:"<path to the Inc folder>" "<path to FREngine.dll>"

Please find more information in the Developer's Help.