From Formstack's own website... "compatible with up to WordPress 4.0"
It wants you to use Formstack's API v1 which is now deprecated and discouraged BY FORMSTACK!
Do not install this plugin!
I'm not sure wrapping if this is just this version or all versions, but wrapping your site in an iframe doesn't constitute as a functioning plugin.
Doesn't work on WP 4.5 as far as i'm concerned.
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