Highlight column of current weeknumber

I am using a planning document covering the weeks of the year in columns. I would like to use conditional formatting to highlight the column of the current weeknumber. I've searched the forum and found a similar topic called 1219586-highlighting-column-with-current-week-number but since I am new I cannot put the link here.

However when using that formula in that sheet, I am not getting the described result. When I try it, the formula highlights the month and the week but not all the way down to row 60 as mentioned by a user.
Let alone that I can manage to transfer this formula into my own sheet and get it to work. I am also using merged cells that span several columns :s not sure if that is an issue too.

Any thoughts on how to do this? Sample file attached.