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I'm trying to create custom widgets but the downloads on the website are all broken links for me. Does anyone else have this problem?
Which documents version did you try to download ?
You can try here
Here is the link for documentation for version 6.5 :
http://support.ptc.com/cs/help/thingworx_hc/thingworx_6.5_hc/
let me know if doesn't work for you.