You will need to log in using the SCS log-in that was used when VP13 was registered. That info was ported over to Magix in 2016-17. Your current Magix Vegas forums log-in may be different.
John, thanks for the quick reply. Your provided link worked out well. When I installed VP13 on my new computer the tool icons seems very tiny and I was wondering what I can do to enlarge them. Your help again would be greatly appreciated. Thanks
When I installed VP13 on my new computer the tool icons seems very tiny and I was wondering what I can do to enlarge them
It seems like that your monitor is 4K or at least with a resolution higher than HD (1920 x 1080). Vegas Pro 13 did not have High-DPI scaling to allow for above HD displays. Even in Vegas Pro 16, DPI scaling was only experimental. If this is a 4K screen issue, you'll need to adjust the display settings in your computer's Windows Display window.
John & Dexcon, thanks for your help. I set my display resolution, as shown in your screenshot, to 1366 x 768 and it defiantly made the tool icons larger. I never would have guessed how to do this on my own. Thanks again to both of you.