Windows 10 and 11 include a significant Tamil font library by default (Nirmala UI). While not exactly "Mcl Mangai," Microsoft's Tamil Sangam MN or Latha fonts are visually similar. You may not need to download anything at all.
Note on Copyright: While many "Mcl" fonts are free for personal use, some may be freeware (free for personal use but not commercial) or abandonware (no longer sold). If you are using this font for a commercial logo or product packaging, verify the license or choose an open-source alternative like Noto Sans Tamil. Mcl Mangai Font Download Free
If you cannot find a safe download for Mcl Mangai, these free fonts offer the same aesthetic and better technical support: Windows 10 and 11 include a significant Tamil
Even after downloading, you might face issues. Here are solutions: Issue 2: I installed it, but Word shows
Issue 1: "The font file is corrupted"
Issue 2: I installed it, but Word shows squares or question marks (???)
Issue 3: The font doesn't appear in Photoshop but works in Word.