Hi.
I think I understand the problem. To use the Time Elements sprite style with my program, you have to use the Time Elements download file that ends with _tdsm.zip, which I think is only available with the Itch.io version of Time Elements, not Steam.
I think your best course of action is contacting finalbossblues, showing him that you bought Time Elements on Steam, and having him give you a download key for the Itch.io version of his asset pack. That way, you will be able to download the version of Time Elements that you can use with my program.
I hope that clears up the issue. Sorry for the confusion. If you have any other issues with TDSM, feel free to email me at jordanbunkework@gmail.com.
Also, I am in the process of releasing TDSM on Steam. I will post a devlog once I have a release date.