How do members log in to pocket download center

im a member and have been for 2 years and when you become a member they send you a link via email, copy it and put it somewhere eg desktop. on more than one occasion the link on my computer has stopped working and i have had to email them asking them to send another link. this can take up to 3 days however they have always sent a link, there admin email is admin@pocketdownloadcenter.com