While modern versions of Adobe Acrobat DC use much higher version numbers (e.g., v19.x), errors referencing typically appear in development environments when the system fails to load the interop assemblies required to bridge the application and the Adobe PDF control. Why You Might See "Version 1.0" Errors

"Could not load file or assembly 'AxInterop.AcroPDFLib', Version=1.0.0.0"

Type regsvr32 "C:\Program Files (x86)\Common Files\Adobe\Acrobat\ActiveX\AcroPDF.dll" and press Enter. AcroPDF.dll - Adobe Community