Reading Library V4.3.11 — clearer live update progress

• Shows the exact amount downloaded and total update size where available.
• Shows MB remaining and percentage complete during download.
• Shows current download speed and an estimated time remaining once enough data has arrived.
• Uses the published update size as a fallback if the web server does not report Content-Length.
• Shows files installed, files remaining and installation percentage during the patch stage.
• Adds a clearer customer-facing completion screen and avoids technical backup paths.
• Updates only Reading Library application files and keeps the safety backup/verification process.
