The online software for 2025 is not yet available. Only the desktop download for 2025 is currently available. Online will be ready in early to mid-December.
In answer to transferring your 2024 information---you must transfer the tax file, not a pdf.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/transfer-last-y...
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