Yes. If you legally purchased Adobe Font Folio 11.1 before the discontinuation date, you are in a stable position. Adobe states: "Yes, downloaded fonts will not be affected". Your fonts remain a perpetual desktop license that you can continue to use.
Font Folio 11.1 was historically distributed via physical media (DVD-ROMs) rather than a simple digital installation portal. Adobe's official policy only preserved digital copies in a buyer's portal for three years post-purchase, meaning official legacy download recovery windows have permanently closed.
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