There is still magic in paper. The paperback Longman Active Study Dictionary often comes with a CD-ROM containing the full text, interactive exercises, and a voice recorder for pronunciation practice. Used copies on AbeBooks or eBay can be found for under $10.
: Brief PDF overviews and samples can be found via institutional repositories like Frequency Lists for Study longman active study dictionary pdf thmyl
You can find digital versions and guides on various platforms: Longman Dictionary of English – Apps on Google Play It's free, ad-free and works offline, too. Google Play There is still magic in paper