| Error | Likely Cause | Solution | |-------|--------------|----------| | “Invalid license data” | Wrong key for 18.1 | Use a key issued prior to 2019. | | “Activation server unreachable” | Old TLS version | Ensure .NET 4.7 enables TLS 1.2. | | “Trial expired even after activation” | Corrupt local cache | Delete %LocalAppData%\DevExpress\ and re-activate. |
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