You must release the license from the old computer and activate the new one. Go to License Center, click your license, go to "Activation and Installation," select the old activation, click "Deactivate," then create a new activation for your current HostID. Download the fresh license file.
typically occurs during installation or activation when the software cannot verify the cryptographic signature or technical configuration of a the license file selected appears to be invalid matlab
: For network licenses, the file must include SERVER and DAEMON lines. If you try to use a "raw" license file from the MathWorks portal on a client machine, it will fail because it lacks these critical server details. You must release the license from the old
This is the most common cause for Individual licenses. When you request a license file from the MathWorks website, you are asked to provide a "Host ID" (often the MAC address of your primary network card). If you downloaded the license file for a specific computer but are now trying to use it on a different machine, the file will be deemed invalid. typically occurs during installation or activation when the
| Cause Category | Specific Reason | Detection Method | |----------------|----------------|------------------| | | Incomplete download, copy error, or disk write error | Compare file size/checksum with original | | Host ID mismatch | License generated for different MAC address or disk serial | Check HOSTID= line vs actual system hostid | | Incorrect format | Missing SERVER line, wrong line breaks (LF vs CRLF), extra spaces | Validate against MathWorks license template | | Expired license | Term license (e.g., student, trial) beyond end date | Check EXPIRE= or ISSUED= fields | | Tampering / modification | User edited INCREMENT or FEATURE lines | Digital signature validation fails | | Wrong license type | Network license used as standalone, or vice versa | Look for SERVER line (network) vs no SERVER (standalone) | | Old FLEXnet version | License generated for older FLEXlm/FLEXnet not compatible with new MATLAB | Error log mentions “invalid license key” |
There are several reasons why MATLAB might reject a license file. Identifying the specific cause is the first step toward a solution.
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