[C#]: 11w49a至13w12~的版本无法正常下载

[TigerZhang1004]

检查项 / Checklist

• 我已在 Issues 页面 中搜索，确认了这一 Bug 未被提交过 / I have searched the Issues page and confirmed that this bug has not been reported yet.
• 我确认只是全部选中而没有仔细确认就直接提交了这个 Issue，并且同意这个 Issue 可以直接被关闭 / I confirm that I checked all boxes without carefully reading them, and agree that this issue may be closed directly.
• 我确认正在使用当前更新分支的最新版 PCL CE，若不是，此 Issue 可能会被直接关闭（更新方式：启动器 设置-关于-软件更新 检查更新，或在 Releases 页面下载） / I confirm that I am using the latest PCL CE version on the current update channel. If not, this issue may be closed directly. To update, check for updates in Settings → About → Updates, or download the latest version from the Releases page.
• 我确认会详细描述我所遇到的问题，并附上日志和截图，而不是随便填点东西敷衍了事 / I will describe the problem in detail, attach logs and screenshots, and avoid submitting vague or incomplete information.

描述 / Description

下载11w47a显示“格式化JSON”

重现步骤 / Steps to Reproduce

1、下载11w49a，显示如下图的错误信息

日志与附件 / Logs & Attachments

Launch-2026-7-6-221131279.log

[Big-Cake-jpg]

bezzad/Downloader#236

[Pigeon0v0]

bezzad/Downloader#236

Downloader v5.9.1 已经发布，解决了这个问题，但应该需要进行一点调整

cc @Big-Cake-jpg