If you are looking for the "full" download of these fonts, it is highly recommended that you avoid third-party "font generator" sites, which can sometimes host outdated or malware-laden files.
If you're looking for STMZH fonts to download, here are some popular resources: stmzh fonts download full
For those looking to expand their collection, you can find various non-Unicode Tamil fonts, including the STMZH series, on the Azhagi Free Fonts page step-by-step guide If you are looking for the "full" download
In newer versions of Photoshop (2021/2022), some users face spacing issues with STMZH. Experts often suggest switching to including the STMZH series