Basically I'll whack the solutions to any gameplay issues that I've patched here, in case you're halfway through a mission and a puzzle has broken.

[+] nextstep.py points to 189.26.0.0 but there's nothing there [PATCHED 9/6/17]
Try either 189.4.28.60 [previous version] or 189.26.0.156 [post patch]
[+] Music doesn't play during the sequencer attack [PATCHED 9/6/17]
Verify Hacknet's cache on steam to force it to download the latest version of the mod, and run
verification tests etc to ensure it gets loaded in (or use reloadext command in debug mode)
[+] Infinite loop on completion of "Execute" mission [PATCHED 10/6/17]
Launch Hacknet in debug mode, run reloadext in the terminal. The loop should break.