It seems that LincDoc didn't distribute the SDK runtime with their integration (or use merge modules if they wrote their own installation package). Instead, their integration depends on the libraries from having the Laserfiche Client 9.0 application installed.
Please have the makers of LincDoc review the Laserfiche SDK 9.0 documentation, particularly the section titled "Distributing Your COM/.NET Applications" in which it states
The SDK installation includes a runtime installation package (LaserficheSDKRuntimeInstaller.exe) that you can distribute with your SDK application. This .exe file installs the necessary runtime components to run a Laserfiche SDK program, but does not include any of the development extras, such as the merge modules, documentation, and sample projects. You can distribute this .exe for both 32-bit and 64-bit applications. The package will detect the computer architecture and install the appropriate files.
There's also a section about using merge modules if they had created their own installation package.
The Laserfiche SDK also includes merge module files for all the necessary Laserfiche components if you wish to manually create custom installation packages. Add the appropriate merge module to your custom installation package to distribute the necessary Laserfiche components.
They should be able to provide the runtime installation.