But it seams that some things are not working as expected:
In the tutorial using SASS is recommended but I cannot find the SASS directory in my default theme folder. Do i need the „Advanced“ version of MODx for the SASS way?
I copied the login.tpl file and changes would be recognized. But the path of the CSS-Files are not updated, because they are hardcoded to the default theme. In my understanding the path should be overwritten if a CSS file with same name exists in the custom theme folder.
Does exists a best practice description for Revo 2.5? Are where any changes from Revo 2.3 to Revo 2.5?
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Did you put the files in a new folder under manager/templates, and change the manager_theme System Setting to point to it? You may have to manually delete the files in the core/cache directory before it takes affect.
You may also have to copy some more files from the default folder to your new one and change the paths in them.