It is quite possible to use Waalaxy without having a LinkedIn Premium account. A classic account gives access to all the features of Waalaxy. What varies, however, is the pricing option you choose at Waalaxy. Indeed, there are 3 different ones (pro, advanced, business) which do not have the same options and possibilities. It's up to you to choose the one that suits you! Note that you can test Waalaxy for free for one month (instead of 7 days usually) here : https://waal.ink/QKE4eb