I'm sorry if you took it this way, it was not my intent. It was aimed to previous person that thought one could cast some magic and fix problem caused by incompatible OS.
Going back to your issue, similar situation (and exactly same error message) was happening for Insurgency Sandstorm. Few people tried to copy DLL library from Win10 or Win8.1 to Win7 to get it running but it was still failing. I'm surprised that HHP v15.1 suddenly started using that specific function and in result broke compatibility with Win7, but if it was done by mistake Doggie Bones may correct it in the future patches.
And you are not missing much, it's only two animations. If you want I can record them for you