As you have already purchased Share Logins Pro from Pluggable.io. At the time of purchase of Share Logins Pro, you have already created an account on Pluggable.io.
To download Share Logins Pro again go to the dashboard page. Sign in with your username and password.
Click the Customer Dashboard, then go to the download from the left side.
You will see a list of all the plugins you have purchased with their download link
Purchased Plugins List
Select the file you wanted to download. Click on it, your file will be successfully downloaded.