GSP for Windows download and license
Geometer’s Sketchpad is a geometry program that I always use for drawing geometric patterns and experimenting with geometric constructions.
Geometer’s Sketchpad is no longer a commercial program. We can download it and use with any available license code. Here is the one that we use while teaching courses in geometric pattern design:
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Name: Geometry and Pattern
License Code: CDPY7T8BVFMZ6QMRK0RJVHHG
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Here are links to some places from where one can download Geometer’s Sketchpad:
https://sketchpad.keycurriculum.com
https://download.cnet.com/The-Geometer-s-Sketchpad/3000-2053_4-75846772.html
https://mathies.ca/gspDownloadInfo.html#gsc.tab=0
If you did not have GSP for Windows installed on your computer before then you can use the license-free version. It is great tool with some recent improvements. Here is the link to download it. You do not need any license. Copy it in a convenient place in your computer and start using (no installation procedure, no license key). This version can be used also from a flash drive.
https://www.dropbox.com/s/vhjkxdtaknh9f25/GSP_ReleaseNONE3.exe?dl=0
GSP for Mac
Here is the page from where you can download the latest version of GSP for Mac.
GSP for Mac is a new development. The objective of it is to create a new version of GSP that will work on the latest Mac operating system.
https://gsptest.scratchconsortium.com/download.html
Please visit this page from time to time to get the latest updates of GSP for Mac.
Symmetrica - A Geometry and Art Blog 