Symptom:
Trying to load LP360 on new computer and receive a message stating that, “The signature for LP360x64_v2015.1.76.7 is corrupt or invalid.”, or “The signature for LP360forArcGIS_v2015.1.76.7 is corrupt or invalid.”
Probable Resolution:
The installation package did not download properly. Try updating your browser to the latest version, or using a different bowser entirely, or an FTP client, like FileZilla, to download the installation (MSI) files.