A couple reasons could be……
You might be getting Form 8959 because the amount of Medicare taxes withheld in box 6 is Not exactly 1.45% of the Medicare wages in box 5. Remove any cents for the Medicare in box 6 and see if the 8959 and upgrade message goes away.
If it is saying you need Schedule 3 and can't use the Free Edition it might be giving you the retirement savings credit. You can say you are a student to decline the credit. You must answer Yes when asked in the Retirement Savings Contributions Credit section if your were a full-time student. The answer to this same question asked in the personal-information section is not the answer that is used.
