Linesmith 4.6.3

Linesmith 4.6.3 is a security update.

• Signed updates: the update list is now signed with an offline key. Linesmith refuses an unsigned or altered list and only downloads updates over HTTPS from algowisp.com, so control of the download server alone can no longer push code to your computer.
• Verified installs: setup installs Python packages only from hash-pinned lists (the exact versions we test), and FFmpeg only as one pinned build whose checksum is verified. Updating from 4.6.x downloads nothing extra.
• Fixes: burned-in subtitles work again when the Windows user folder contains an apostrophe.

Updating: Linesmith 4.4, 4.5 and 4.6 update themselves to 4.6.3 when you close the app. From 4.3 or earlier, download and run this release once.

Linux requirement: the AppImage needs glibc 2.34 or newer (Ubuntu 22.04, Debian 12, Fedora 35 and later). This was already true for earlier versions; the documentation now says so.

Downloads and SHA-256 checksums are attached below.