The latest version of IguanaTex (currently v1.56 -- May 16, 2018) should work for all users, on 32-bit or 64-bit Windows, running 32-bit or 64-bit MS Office, on PowerPoint 2003, 2007, 2010, 2013, and 2016.
Recommended download (all users): IguanaTex v1.56 (.ppam) (May 16, 2018)
Important note regarding malware detections: Recently, several anti-virus softwares and firewalls have started reporting IguanaTex_v1_56.ppam as malware, sometimes even blocking download. After careful review of the code, I believe that these are false positives (more details at the bottom of this page). If you are having difficulties downloading the file above, you can either white-list it with your anti-virus software, or try one of the other versions: Password protected .zip file containing the add-in (password: IguanaTex), Official source (for the source version, open and "save as" a .ppam add-in file, then load that add-in).
v1.50+: vector graphics support; batch edit mode; insertion of vector graphics files (.pdf/.eps/.ps/.emf) as PowerPoint shapes; and many more.
v1.40+: platex (Japanese) support; templates; per-display settings; TexPoint compatibility; read .tex from file; edit in external editor; regenerate multiple displays at once; relative path settings; and many more.
Since v1.37: UTF-8 support; new PDF to PNG conversion option, e.g. to handle Tikz; selection between pdflatex/xelatex/lualatex; various usability improvements; better error handling.
IguanaTex Google Group: To be informed of the release of new versions, you can join the IguanaTex Google Group.
IguanaTex is free, but if you like it and would like to show your appreciation, I encourage you to donate to the non-profit Union of Concerned Scientists through my IguanaTex Fundraising Page. The Union of Concerned Scientists "puts rigorous, independent science to work to solve our planet's most pressing problems", first and foremost global warming.
Note 1: When upgrading to v1.34 or later, you may notice that some displays (typically larger ones) created with versions up to v1.33 change size when editing them. This is a once-per-display necessary inconvenience to handle an inconsistency in how PowerPoint inserts images.
Note 2: v1.50 fixes a rescaling issue occurring when using computers with various DPI settings. The caveat is that this results in a one time resizing inconsistency for displays created on monitors with DPI other than 96. (I tried very hard to make this backward compatible, but came to the conclusion that it was not reasonably possible.)
IguanaTex v1.55 (.pptm) (May 16, 2018)
If you modify the code, you will need to save it as a new .ppam add-in file, remove the current version of the add-in and add yours instead.
Github: the source code for all versions of IguanaTex is also available on Github.
For PowerPoint 97-2003: if you have trouble with the .ppam add-in, you can try IguanaTex v1.56 (.ppa) (May 16, 2018)
Older version: if for any reason the latest release does not work for you, you can try the previous stable release v1.47 (.ppam), (.pptm).
More details regarding malware detections: As can be seen on virustotal.com's analysis, a binary component containing macros I wrote (or included after checking they were safe) is being flagged as suspicious. You can check the content of all macros in the analysis. If someone has a clue how to avoid such false positives, please contact me.
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