Reliable Update Handling

🛠 Fixes

• Fixed potential issues with app updates when the downloaded zip file was incomplete or corrupted.
• Added automatic recreation of outdated update files (older than 5 minutes) to prevent failed installations.
• Improved error handling and validation for update archives.

🔄 Improvements

• Update process is now more stable and transparent — users are less likely to face update errors or stuck downloads.

And other improvements