This article explains how to fix the 'Error 1320 - The Specified Path is Too Long' during 123Scan Installation

Typically, the ‘Error 1320 - The specified path is too long’ occurs on computers with pre-installed Windows operating systems. It is caused by the invalid junction point at :\ProgramData\Documents, which resolves to a non-existing location or network drive location instead of the Public Documents folder. This can occur on any Elo device with a preinstalled operating system such as EloPOS, Windows I-Series, or ECMG. 

See this article from Zebra on how to resolve Error 1320.