RLTM 2.1.4 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The actual developer of the software is Hotwork.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. Commonly, this program's installer has the following filename: RLTM.exe. The most popular versions of the software are 2.1 and 1.0. The software is included in Photo & Graphics Tools.
From the developer:
The Refractory Lining Thermal Modeller (RLTM) is a tool for rapid modelling of heat flows through furnace, heater and kiln linings. This app supports entry of materials in both ASTM and metric systems (or combinations), and produces results in either ASTM or metric.
You may want to check out more software, such as ThumbsPlus Digicam Raw Plug-in, graphite or OpenSceneGraph, which might be related to RLTM.