Electrum 4.2.1 Release

March 26, 2022

Windows Support Changes:

Dropped support for Windows 7 (#7728)
Windows 8.1 still supported, but Windows 10 is the primary tested version

Binary Updates:

Upgraded bundled Python versions:
- Windows, macOS, AppImage: Python 3.9.11
- Android: Python 3.8.13 (Includes fix for OpenSSL DOS vulnerability CVE-2022-0778)
Windows: Updated PyInstaller to 4.10 and Wine to 7.0 (#7721)

Kivy GUI (Mobile) Improvements:

Fixed “Child Pays For Parent” functionality on Android (#7723)
Reverted to English as default UI language (25fee6a6)

Qt GUI (Desktop) Enhancements:

macOS: Fixed “Preferences” crash issue for some users (#7725)
Improved startup resilience with better error-handling and fallback (#7447)

Core Library Updates:

Enhanced Lightning Network error/warning message handling (a92dede4)
Disabled automatic wallet backup during LN channel opening (#7733)
Fixed over-deletion of transactions in Imported wallets (#7587)
Resolved potential deadlock in wallet.py (d3476b6b)

Hardware Wallet Support:

Ledger: Added progress indicator for transaction signing (#7516)

Other Improvements:

Fixed --portable flag functionality for AppImage and pip installations (#7732)