This was already answered in a different thread:
"Go in your account and click on 'Purchases'. Then click on the 'Download' button for the MecaFig add-on."

If you can’t find the .zip file after purchasing Mecafig, first check your browser’s default download folder or search your computer for recently downloaded files. Sometimes antivirus or browser settings can block downloads, so it’s worth checking your quarantine or download permissions. While you’re managing files, you can also try a Free Twitter video downloader to ensure your downloads are saving correctly and test if your system handles downloads without issues.