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The links to the product families on the support website are all broken (except for ThingWorx.)
It looks like someone restructured the main website and forgot to update the support site. Notice the change in destination:
vs.
P.S. This probably isn't the right place, but I don't feel like hunting around on PTC's website to try and figure out where to submit this.
Looks like someone added link redirection because the URLs are now automatically resolving to the new locations.