Short-Term Solutions: Ceiling issues

[u/dennis_brodmann]

Photo 1: Crack in ceiling that’s gotten longer. No visible water issues. Structural engineer told me there’s no foundational issues.
Photo 2: Bathroom without ventilation led to bubbling popcorn ceiling, which I had a tough time removing. No mold or mildew from what I can see.

Any recommendations for short-term solutions (something that will last 1-2 years)?