If you have an older camera that specifically requires version 3.1 due to OS compatibility (like Windows 7), check the Fluke Product Guide for legacy support or contact their support team directly, as third-party "free download" sites often bundle malware with old installers. Fluke infrared tools
For on-site analysis, the Fluke SmartView Mobile app is available for free on the Apple App Store. System Requirements Fluke Smartview 3.1 Free Download