The Xpress method for optimization requires a license for the Xpress Optimizer commercial solver.

Use the community license

A dated community license is included with the Mathematica installation. After it expires, you may request a current community license from FICO. The community license is subject to restrictions on problem size.

Get a free trial or academic license

Request a free trial or academic license from FICO.

Purchase a license

Alternatively, purchase a commercial license from FICO.

Verify the license

Evaluate an example with the Xpress method in the Wolfram Language to verify the license: