Sorry----those IRS links must have changed---it seems some of the links provided to you were bringing up 2023 forms on the IRS site instead of the prior years you want. You can search for the prior year forms here
https://www.irs.gov/prior-year-forms-and-instructions
We do not know what sort of income or information you need to enter, so we cannot know all of the specific forms you might need like Schedule C for business expenses, etc. You can enter the year in the search box on the IRS site and then scroll through the long list of forms---the "numbers" of the forms go from low to higher, so it takes patience to scroll through them.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
