Hello
Sorry for the inconvenience.
Could you kindly let me know where you are trying to download the Templates from? Are you asking about the Layout bundles here? Could you kindly explain a bit more for better understanding?
For layout bundles, import it to SP Page Builder -> Pages. Kindly try clearing your Joomla and browser cache for this issue. If possible, check with a different browser as well.
If the issue still persists, kindly share your administrative access, please. Use the hidden mode to share the log in credentials.