I simply call this the Black and Grey View

How would I install this - do I download the text file and import?

Tried that - but the preview looked weird?!!!

Should have looked similar to his site.

I uploaded this style and now I'm having issues with the collapsable category buttons functionality.

Any time I select to hide or expand a category the button dissappears leaving me unable to undo my last step. Once I refresh the page the buttons reappear so I can set the category back to its original state, but once I do that the buttons dissappear again.

http://forum01.cardomain.com/ubbthreads.php

Is there any way to keep the buttons from dissappearing?

your link is dead

I haven't tried this one, but as long as you are running 7.0.2 you should be okay - it will not run fully on 7.1 due to additional classes being required.

I'm pretty sure it was issues with our test environment, also why the link was dead. I will update once it's been fixed.

How do I make this work with 7.5.5

I never tried this template but anyway.
Like most all other older templates.
New css classes have been added or changed on each software revision.
Since this template is for 7.0 and the current version is 7.5X.
You could install it. Then you would need to find the missing css classes missing and correct them.
You could simply just use the copy default link in the control panel style editor for a quick fix for each one.
But you would need to go through each one.
Since I don't see a revised version of this template.

Yeah you'll need to install it and then just go through the style editor looking for empty cells, these will be "new" ones added since the style was created.

The new classes usually have a "copy from" link to the right, clicking this will populate the data from the "other" cell that it states; a lot of the time it'll be approximately what you want to use.

After editing a style, be sure to save.