Update dependency Downloader to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Downloader	3.3.4 → 5.9.6

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Release Notes

bezzad/Downloader (Downloader)

v5.9.6

A download now always reports how it ended.

🐛 Fixes

• A download could finish without ever raising DownloadFileCompleted. StartDownload ended in one of four branches, and the last one — an "unexpected" terminal state — only logged a warning and returned. For anything driven by the events (rather than only awaiting the task) that meant the download never ended: no error, no file, nothing to retry, and a UI left showing it as still in progress. That branch now always sends a completion signal.
• Pausing exactly as the last bytes arrive no longer throws the download away. A Pause() that lands after every byte has been received leaves the status Paused with nothing left to do — a finished download. It is now reported as Completed instead of falling into the unexpected-state branch and being discarded.
• Any other unexpected terminal state is reported as Failed with an IncompleteDownloadException naming the state and the byte counts, so the cause is visible instead of silent.

🔧 Under the hood

• New integration tests (CompletionSignalTest) cover all three terminal paths — completed, cancelled, and paused-at-the-finish-line. The last one fails against 5.9.5.

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Found while tracing a download manager whose row stayed "downloading" forever against a server that refused its requests (Downloader.Desktop #​9).

v5.9.5

Fixed

• Rare IOException: The process cannot access the file … .download when finalizing a download (issue #​239): downloader-owned file deletions now retry with exponential backoff (~3s) to ride out transient external locks (e.g. antivirus real-time scans); a permanent lock now fails with a clear error attributing it to the external process, original exception preserved as InnerException.
• RemoteFileResolver.GetFileInfoAsync no longer rethrows the internal connect-timeout cancellation as a hard failure on slow/unreachable hosts; it falls back to the URL-derived file name as documented.

Added

• .NET 11 (preview) target (net11.0) for the library, validated by CI on Ubuntu/macOS/Windows.

v5.9.4

Fixed

• Resume after a failed attempt no longer restarts from 0%: a transient transport error (timeout, dropped connection, 503/504) no longer discards already-downloaded chunk progress when the single-connection fallback engages. A failed attempt now stays resumable from its last position.
• Silent file corruption when resuming a multi-chunk download against a server that reports no range support: the stale chunk layout is now rebuilt so restarted bytes are written at the correct offsets.
• Off-by-one in the chunk-completion check that treated a chunk left exactly one byte short as complete, which could fail a download near 100% and make its final byte impossible to resume.

v5.9.1

Fixed

• Release packaging: stop building/pushing an empty symbol package; keep the embedded-PDB symbol-package fix.

v5.9.0

Added

• RemoteFileResolver with GetFileNameAsync(url) and GetFileInfoAsync(url), returning RemoteFileInfo { FileName, FileSize, SupportsRange, Address } from a single header probe — preview a queued download's name and size without starting one.
• IDownloadService.GetFileInfoAsync(url) exposes the same lookup on the service.

Changed

• Filename/size/range resolution unified behind SocketClient.GetFileInfoAsync, shared by the download pipeline and RemoteFileResolver. No behavior change to existing downloads.

v5.8.1

Fixed

• Cookie handling for CDN redirects.

v5.8.0

Added

• Fallback to a single connection for downloads on transient transport errors.

v5.6.0

Fixed

• Download cancellation and progress reporting bugs.

v5.4.0

Added

• AOT compilation support for .NET 8 and later.

v5.3.0

Fixed

• URL encoding for square brackets in download paths (#​223).

v5.2.0

Fixed

• Servers that reject the Range header with 403/404/503 now fall back to a normal request (#​220).

v5.1.1

Fixed

• Maintenance release.

v5.1.0

Added

• Custom HttpClient support, plus related fixes (#​219).

v5.0.0

Changed

• Improved resume-download functionality and error handling (#​217).

v4.1.1

Fixed

• Redirected-URL download fix.

v4.1.0

• Pre-release.

v4.0.3

[4.0.3] - 2025-08-09

v4.0.2

[4.0.2] - 2025-07-12

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