Bruker provides the commercial version and Dr. Coelho provides the academic version. For non-clay minerals, it is very straight forward using its GUI; but all the advanced usage is to be done in the non-GUI mode. A good editor is needed so all the reserved keywords can be highlighted for efficiently edit the file. The following website recommends JEDIT, which is free.
[Out of curiosity, I searched Koalariet, it is still there in the web space. It was also written by Dr. Coelho, the structure and input files are the same. If you want to get a taste of Topas but you don't have money, you may want to give this a try. It is free, or was free. I'll give it a try soon in the future for the economic users.
http://ccp14.chem.ucl.ac.uk/ccp/ccp14/ccp14-by-program/xfit-koalariet/xfit-koalariet-win95/read1st.txt]
http://www.topas-academic.net/
The latest version is version 5. what is new in version5.pdf
Tutorial is here http://community.dur.ac.uk/john.evans/topas_academic/topas_main.htm
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