This article discusses installing the latest driver on Windows 7 and getting digital signing issue and cannot install message

Microsoft KB Requirement for Windows 7 and Server 2008 R2:

To enable SHA-2 support on Windows 7, three Microsoft KBs need to be installed before installing Elo’s driver package. Please follow steps below to install the KBs:

a. Install KB4490628
b. Install KB4474419 then reboot
c. Install KB4534310 then reboot.

Elo Multi-touch version 7.0.0 (or newer) has been signed with Microsoft’s Sha-2 signature, the 3 KBs must be installed before installing Elo’s driver 7.x.0 package.

For detailed requirements to enable Sha-2 support on Windows 7, please see the Microsoft document: https://support.microsoft.com/en-us/help/4472027/2019-sha-2-code-signing-supportrequirement-for-windows-and-wsus

The above information can also be found on page 2 of the Driver's User Manual which downloads with the driver or can be viewed HERE