BE AWARE! Windows 7 users: python 3.9 libraries are not supported anymore in Windows 7. So if you still use W7, upgraded version Electrum 4.2.0 will stop working. You could stay on 4.1.5 or upgrade to Linux OS. Windows 10 users not affected.

Release 4.2.0 - (March 16, 2022)Release 4.2.0 - (March 16, 2022)

• The minimum python version was increased to 3.8 (#7661)
• Lightning:
  • redesigned MPP splitting algorithm (#7202)
  • trampoline: implement multi-trampoline MPP (#7623)
  • implement option_shutdown_anysegwit, and allow dust limits below 546 sat (#7542)
  • implement option_channel_type (#7636)
  • implement modern closing negotiation (#7586, #7680)
• improve support for "lightning:" URIs on all platforms (#7301)
• Qt GUI:
  • add setting "show amounts with msat precision" (5891e039)
  • add setting "add thousand separators to bitcoin amounts" (#7427)
• CLI/RPC:
  • implement Unix sockets and make them the default (#7545, #7566)
  • add "bumpfee" command (#7438)
• Kivy GUI:
  • show network setup on first start before wallet creation (#7464)
  • add "Child Pays For Parent" option (#7487)
  • improved locale handling (22bb52d5, 7cb11ced, 4293d6ec)
• Hardware wallets:
  • trezor: bump trezorlib to 0.13 (#7590)
  • bitbox02: bump bitbox02 to 6.0, support send-to-taproot (#7693)
  • ledger: support "Ledger Nano S Plus" (#7692)
• Library:
  • added support for sighash types beside "ALL" (#7453)
  • signmessage: also accept Trezor-type sigs for segwit addrs (#7668)
  • network: make request timeout configurable (#7696)
  • paytomany (onchain txout batching) now allows multiple max("!") amounts with specified weights (#7492)
• Binary builds
  • AppImage: changed base image from ubuntu 16.04 to 18.04 (5d0aa63a)
• migrated from Travis CI to Cirrus CI (#7431)
• Lots of other minor bugfixes and usability improvements.