Candidate object fields don't match Data Security module (missing Job Category, Apex, C#, Hire By, etc.)

Hi All!  

I'm on the "Control Access to Fields" unit (

Admin Intermediate trail, Data Security module), specifically the "Set Field Permissions for Multiple Permission Sets" step, which asks me to set field-level security on the Candidate object's Job Category field. That field doesn't exist anywhere in my org (confirmed via a global Setup search), and neither do several others the unit references — Apex, C#, Hire By, Hiring Manager, and the sensitive ID field mentioned in the unit text. 

My Candidate object does exist, with fields like Current Employer, Currently Employed, Education, Years of Experience, Legacy Candidate Number, etc. — a completely different set from what the unit describes. 

For context: earlier in this trail I ran into a separate issue where the Position/Candidate/Job Application/Review objects didn't exist at all, which I resolved by installing a package referenced in an earlier community thread. That got the base objects working, but it looks like this package doesn't include the custom fields (Job Category, Apex, C#, etc.) that this later unit assumes exist — I suspect those are meant to come from manually completing "Create Custom Recruiting Fields" in the "Build a Data Model for a Recruiting App" project. 

Has anyone else run into this specific mismatch? Is completing that earlier project the right fix, or is there a different/updated package I should be using instead? Any guidance appreciated.

Thanks!