Telerik Document Processing is part of several Telerik bundles and is installed following the steps for installing the suite with which you've obtained the product.
Starting from Q1 2016, the Document Processing assemblies have an assembly version which may differ from the assembly version of the other assemblies in the particular suite.
Starting from R3 2016, only assemblies with a version number ending with .40 suffix are distributed. The libraries don't contain code specific for .NET Framework 4.5, thus an additional version is not needed.
The changes are synced between the controls that have a dependency on Telerik Document Processing and while the referenced files are from the same release, they should work as expected regardless of the version distinction.
When the installation completes, the Telerik Document Processing assemblies will be available in the AdditionalLibraries sub-folder.
When the installation completes, the Telerik Document Processing assemblies will be available in the spreadsheet sub-folder.