Hi Christina!
Corel maintains the following website for learning CorelDraw: https://learn.corel.com/
On that website I searched for “installing templates” and this help video was made available: https://learn.corel.com/tutorials/how-to-use-coreldraw-templates/#1552316717834-7a23715d-20ca
There are tabs at the top of the webpage for PC, Macintosh, and several other selections.
Please let us know if this provides the information you require!