Initial situation:

The REDDCRYPT addin crashes on startup, various exception errors are reported.
These could be, for example, the following:

• The system cannot find the specified file
• Access denied
• System.IO.FileLoadException
• The file or assembly “Microsoft.Office.Interop.Outlook, Version…” or a dependency of it was not found. The system cannot find the specified file.

Information on the error message:

• In most cases, the user does not have read authorization for one or more DLL files.
• The required files or the files for which the access rights are not correct are mentioned in the error message.
• Windows saves the DLL files in a so-called global assembly cache (GAC).
• Depending on your system, this is located under%SystemRoot%” or%SystemRoot%.NET\assembly”

Solution to the problem:

Check whether the DLL files from the error message can be found in the above subfolders. For the Office.dll this can be one of the following paths (depending on the Office version):

• C:\Windows\assembly\GAC_MSIL\office\14.0.0.0__71e9bce111e9429c\office.dll
• C:\Windows\assembly\GAC_MSIL\office\15.0.0.0__71e9bce111e9429c\office.dll

If the file was found, check whether the logged-in user has the required read rights to this file.

If the file cannot be found in any of the subfolders, the installation of .net, Office or the add-in may be faulty and require reinstallation.