Unheard of error message when creating a project

After a few days off, I wanted to create a new project in Studio 2019 SR2 and received the following error message when starting the project wizard:

"Failed to load project template from C:\Users\myname\Documents\Studio 2015\Project Templates\Default.sdltpl: Could not find a part of the path C:\Users\myname\Documents\Studio 2015\Project Templates\Default.sdltpl".

This prevented me from creating my project. I had to do it on Studio 2017 which luckily I still have.

I only use templates on a separate drive, which has always worked with all Studio versions including the latest one and, besides, I don't have Studio 2015 on my machine anymore.

Could anyone tell what happened here?

Best regards,

Diego