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Do not use a Mac to download the license file. Mac OS often adds hidden resource forks or changes line endings. Use a Windows PC to download the .elic file. If you only have a Mac, download the file, then use a tool like "TextWrangler" to save it as a "Windows (CRLF)" file before transferring.
Store a copy on a secondary USB drive and in a cloud folder (like Google Drive) that you can access from any internet-connected device. If your license corrupts, you can re-apply the same file without calling support.