Downloads are public. Activation happens inside the app using the email address you used at purchase time.
Since this is a hard-coded limitation of the uTorrent software, there is no setting within the application to "enable" support for 64MB pieces. Switch to a Modern Client
Even the 64-bit version of µTorrent is built on the same legacy codebase. The limitation is not just 32-bit memory addressing; it is a deliberate fail-safe in the piece verification logic that has never been patched. utorrent unsupported piece size 64mb
If you were to create a torrent for a 1TB file using a standard 4MB piece size, the .torrent file would be roughly 32MB in size. That is too large for many trackers to handle and takes too long to parse. By increasing the piece size to 64MB, the .torrent file shrinks down to a manageable size (roughly 2MB). Since this is a hard-coded limitation of the