A friend who is ED of Safe Shores (DC Children's Advocacy Center) says that Good Touch, Bad Touch has fallen out of favor. Safe Shores uses Stewards of Children, developed by Darkness to Light, and staff members are certified trainers.
Perhaps reach out to Darkness to Light or your local (regional) children's advocacy center. Many states have more than one. Not sure about the status internationally, but in the US, I know this is the case.
In my 20+ years doing public policy advocacy on a number of issues related to children, I came across too many organizations that had the potential to harm children and families, through using poor prevention models, infidelity to the model, not understanding issues, thinking that doing something was enough. While I'm generally a fan of doing something is better than doing nothing, that is absolutely not the case with this topic.
Good luck!