Stage1 copies the ISO and will use your BigFix infrastructure to place the ISO on each endpoint.
Stage2 - I’m unsure where the error is being seen. After downloading it and when trying to import it? If you’re copying/pasting the code, you need to make sure its plain text; straight quotes being replaced with smart quotes is a good example where relevance will error.
Anyway, I probably can’t help you with the little info being provided. The Stages seem to work for others. Sorry.