This trainer doesn't seem to recognize my offline key so I can't play on my laptop, other trainers work fine so not sure if it's something on my end or this trainer.
Did you create a new offline key and tried again? Please launch the offline key creator tool with admin rights and follow the instructions -> Link
A new key does work, odd that is randomly stopped working but at least it was an issue on my end.
I assume you're using Windows 10. With each big annual update of it (more of an upgrade) there is so much changed in the OS that you need to create a new key.