If you have any of the above missing but they are still available in older projects, you can just copy and paste the files to the folder of your new project.
I have various “template” folders, say for example I’m using foundation, I have a template which includes all the base files needed and I copy that base template each time I start a new project.
You can do this with bootstrap blocks, start a new project - if there are files missing, copy and paste them into the folders location - save that project as “bootstrap blocks template”. Each time you start a new project and you want to use bootstrap blocks, open your template folder - instead of new page (within Pinegrow) - (but make a copy of your template folder for future use.