You can download QSTEM 2.30 from our software library for free. The current setup file available for download requires 3.6 MB of hard disk space. Our built-in antivirus scanned this download and rated it as virus free. The software is included in Education Tools. This free software was originally produced by Christoph T. Koch.
From the developer:
QSTEM is a suite of software products for quantitative image simulation in electron microscopy, including model building and TEM/STEM/CBED image simulation.
You may want to check out more software, such as LoadRunner, SatCalc or gitoolbox, which might be related to QSTEM.