Hello Nevs,

thank you for reporting these issues in the documentation. We are actively updating it but there are pages that still need some updates.

The page you mentioned has indeed wrong paths and it must have been the case way before we even took over the project.

The files mentionned should be found under:

/plugins/j2store/app_[the name of the app]/app_[the name of the app]/tmpl/[the name of the app]

The app name is the name of the app used for theming, for instance, most likely bootstrap5 under Joomla 4/5.

Give it a try and let me know how it is working out :-)

Nevs,

If there is no directory in your template's html folder, then you would need to create it. 
If your template's name is nev_template for instance:
/templates/nev_template/html/
then simply create the following folders inside the html folder:
com_j2store - then inside com_j2store add a templates directory

then inside the templates directory add the file name of the template that is being used in the category view found here:

If you have Bootstrap 5 selected in your menu sub-template setting - then the plugin folder name would be app_bootstrap5 so you would remove the app_ and the folder you would create inside the templates directory would be bootstrap5 

the full path you would have using the settings I mentioned above would be :
/templates/nev_template/html/com_j2store/templates/bootstrap5

or if using the sub template shown in the image above it would be:
/templates/nev_template/html/com_j2store/templates/superstore

then you would simply add and of the subtemplate overrides you have into that folder such as view_simple so the final path where that file should be is:
/templates/nev_template/html/com_j2store/templates/bootstrap5/view_simple.php

If you are bringing over files from a bootstrap 3 layout from Joomla 3 for instance - I would strongly recommend that you bring over you changes from the old file into the new one (instead of just dropping it in the folder "as is" - because J2Store 4 uses the latest Bootstrap 5.3+ while J2store 3 used either Bootstrap 2 or 3. 

Adam