Just noticed the link you asked about.
This Link/download site is not associated with LingQ in any way.
These are official LingQ products/sites/extensions/apps:
- https://www.lingq.com/
- https://chrome.google.com/webstore/detail/lingq-importer/eaanhanppiifopiabnfmhjbikjmeeale
- LingQ Importer – Get this Extension for 🦊 Firefox (en-US)
- LingQ Importer - Microsoft Edge Addons
- Other “LingQ Importer” extensions for other browsers that show up as LingQ providing the extension
- And of course the Android LingQ app from the Play Store and the Apple LingQ app from the Apple store mentioned by zoran in an earlier reply
Qoute from LingQ guide: