2021 can't be done with Turbotax. 2022 through 2024 require the desktop version for that year and can not be e-filed. if you are due a refund for 2021 it's forfeit. if you owe the IRS can pursue collection at any time.
https://turbotax.intuit.com/personal-taxes/past-years-products/
2025 can be done online or with a desktop version. online works with Windows 10. desktop requires Windows 11.
