Stata 13 Trial -

If you specifically need Stata 13 for a class but can't find a trial:

If you need to test Stata for research or coursework, you can request a trial for the (Stata 18). Stata 13 Trial

If you cannot get a license, consider R (using the RStata package) or Python (Pandas), which are free and can perform many of the same econometric tasks. If you specifically need Stata 13 for a