You received a beautifully styled .ass file — custom font, colored outline, lower-third placement — but the toolchain downstream only speaks .srt. A DVD authoring app, a legacy editor, a hard-sub encoder or a simple player will reject or mangle ASS. You need the plain version.
The ASS/SSA to SRT Converter flattens the styled file back to universal SRT. It reads the [Events] block, takes each Dialogue: line, remaps the centisecond timing to milliseconds, turns override tags like {\i1} back into <i>, converts \n line breaks into real lines, and renumbers the cues 1, 2, 3. The spoken text is untouched — only the styling wrapper is stripped.