All themes and plugins are released under the GPL license. You are free to use them as many times as you like.
WordPress is open source software and is built under the GPL (General Public License) which you can read more about at the WordPress website license page.
So it is completely legal to download plugins and themes from this Vimscompany website. Download as many as you want and use them in as many projects as you want.
The main difference between us and the developer is that we do not provide any support.
So if you think you will need ongoing technical support for a product, consider purchasing from the developer. Links to each developer are provided on the directory pages.
If you have any questions, please contact us.