If your subtitles are slightly out of sync after loading them, players like VLC or MPC-HC allow you to shift the subtitle timing forward or backward by milliseconds using keyboard hotkeys ( H and G in VLC).
If you are looking to download the external .srt files, check these popular platforms: Andor Legendas PortuguГЄs (Portugal) S01E12
offers a broad database with direct access to Portuguese (Portugal) files for specific web rips. If your subtitles are slightly out of sync