I recently downgraded to Classic Starter from Premier and lost all my investments (investment accounts only showed cash balances, and the 'Holdings' screen was missing all of the securities, but the transactions remained in the register). I promptly did a pro-rata upgrade to Deluxe, refreshed the license and everything came back.
This could have been avoided if the software matrix page
https://www.quicken.com/products/pricing-comparison-classic/
included Starter on it.
[Edited - Enabled Link]