The official and safest way to get the tool is through the manufacturer's resource pages: Official TSC Support : Visit the TSC Support & Downloads
The TSC DiagTool serves as a comprehensive "toolbox" for both end-users and technical support teams. Tech support secrets: TSC's printer configuration tool tsc diagnostic tool v163 download better
Version is particularly critical for users with modern hardware: it is the standard version for printers running firmware higher than V6.78 and is required to properly interface with Bluetooth and WiFi modules on firmware V7.04 and later. Key Features & Functionality The official and safest way to get the