Adding tag "nofollow" to Catch Themes link in footer

Hi and thank you again for your great support. In order to avoid any possible penalty from Google for excessive outbound linking, it seems to me that would be useful to add a "nofollow" tag for the Catch Themes link in the footer. I'd like to keep the footer as it is now because I want to promote your great work and support, but I've found that dofollow links in footer can damage both the site and the destination site... https://support.google.com/webmasters/answer/66356?hl=en Thank you again, best Francesco