The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Langapp Sp. z o. o.:
IELTS Exam by Vocabla is an app for improving your English vocabulary. It will help you pass your IELTS exam.Product features:* Intelligent and easy tests * English word definitions prepared for IELTS exam* Your progress stats * You can collect Badges* You can compete with other users in RankingAlso check out Vocabla app: https://itunes.apple.com/us/app/vocabla-vocabulary-app/id616731725