Download of Mass Spec Calculator Pro 5.1.1.35 was on 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 free software is Quadtech Associates Inc. We recommend checking the downloaded files with any free antivirus. The software lies within Education Tools, more precisely Science Tools.
From the developer:
Mass Spec Calculator Pro is a free Windows program to assist in the interpretation of unknown GC/MS spectra. Chemical structures can be drawn on screen, read from molfiles or pasted from a SMILES string and then interactively fragmented as desired by breaking selected bonds, with the resulting masses and compositions displayed in each case.
You may want to check out more software, such as ConverterCE Pro, SensorLink PRO or FinitySoft BMI Calculator, which might be similar to Mass Spec Calculator Pro.
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