How to solve the "Key code invalid format" problem when using "grbgetkey" in MATLAB command

[LCHSC]

Hello everyone! I’ve encountered a problem as below.
I downloaded the Gurobi 11.0.1 version first, and it occured the problem as shown in the figure. Then I downloaded the 9.0.0 version, and it occured again. I want to know the exact problem and the solution to solve it.
Thanks for your support in advance!

[LCHSC]

And I’ve asked the Gurobi official members about this problem, their reply was that the 9.0.0 version is already not in the technical support category

[Erling (Erling D.Andersen)]

See

Announcement: CVX 2.2.2, the first "full" open-source release

As discussed in this blog post, CVX is being moved to a full open source model. From this point forward, the latest tagged/versioned build of CVX will be available at this GitHub Releases page. On that page you will find links to download cvx.zip or cvx.tar.gz. Both contain identical content: The full CVX source code Pre-compiled MEX files for Linux, Windows, macOS Intel, and macOS Apple Silicon Open-source solvers SeDuMi and SDPT3, compiled for the same platforms Open-source versions of the …

[mcg (Michael C. Grant)]

Thank you for the assist, @Erling .

His advice is correct—please download the latest open-source release. Note that this release does not include the cvx_grbgetkey package. Instead, follow Gurobi’s own instructions for activating your license and making sure Gurobi is available to MATLAB. Once that is complete, run cvx_setup.

[LCHSC]

Thank you for your assist!

[LCHSC]

Thank you for your reply!