If you download a template and it's not compatible with your version of Premiere, you may need to upgrade to a newer version of Premiere. Alternatively, you can try to manually modify the template to work with your version of Premiere, but that can be a time-consuming process and may not always work. I've had good experiences with Motion Array and Envato Elements. Both of these websites offer a wide range of templates for Adobe Premiere, and they usually list the compatibility requirements for each template. Motion Array has a great selection of Adobe Premiere templates, including intros, titles, transitions, and more. You can browse their selection of
premiere templates at taketones.
Envato Elements is another great option for Adobe Premiere templates. They offer a wide range of templates for different types of videos, including music videos, travel videos, and vlogs. You can browse their selection of templates at envato