Nothing to install: open https://retro.theiguru.au/sengoku/ in a recent Chrome, Edge, Firefox or Safari. Keyboard, mouse and touch all work. The music starts at the first key press or click, because browsers require that. F, or the button at the top right of the page, shows the game full screen.
Sengoku-1.7.0-x64.msi from https://retro.theiguru.au/sengoku/desktop/ and run it. It installs for your user only, so no administrator password is needed, and adds Sengoku to the Start menu and the desktop.The Windows edition is built and tested under Wine. If something doesn't work on your Windows PC, please say so (see Contact).
To upgrade, run the new installer: it replaces the old version and keeps your saves. To remove it, use Settings > Apps.
sengoku_1.7.0_amd64.deb and install it: sudo apt install ./sengoku_1.7.0_amd64.deb
sengoku.The package is for 64-bit Debian, Ubuntu, Kubuntu, Mint and other Debian-based systems. Installing a newer package upgrades the old one.
On Linux the music plays through pw-play, paplay or aplay, whichever is installed. Set SENGOKU_MUTE=1 to start without sound.
The downloads page shows the SHA-256 checksum of each file, and SHA256SUMS beside the downloads lists them all. On Linux:
sha256sum -c SHA256SUMS --ignore-missing
The body point cost of every order and the other balancing values (interest, training, hiring, alliance lengths, movement points in battle and so on) can be changed without rebuilding the game. Copy rules-example.ini (on Linux in /usr/share/doc/sengoku/; in the source in docs/) to rules.ini in the same folder as the game's options.ini (~/.config/Sengoku - Road to Unification/ on Linux, %LOCALAPPDATA%\Sengoku - Road to Unification\ on Windows), and change the values you want. Values out of range are kept within limits, and unknown keys are ignored. Delete the file to go back to the standard rules. The browser edition and online games always use the standard rules.