There are, of course, various applications. Because doing it manually is too long and problematic. Export LinkedIn contacts using Dripify https://dripify.io/features/leads-data-export-to-csv/ Linkedin profile scraper. In addition to this you will also get phone numbers, email addresses, and many others. If you don't want to buy the program right away, you can use the free version for a month. It's no different from the purchased version, so you can get the hang of it all.
Select Connections. Click Request archive. Enter your password and click Done. You'll receive an email to your Primary Email address which will include a link where you can download your list of connections.