Please see the screenshot 2 beneath, after my failed attempt to fulfill Step 3:

  1. Search for Convert All Spots to CMYK and run Fix. Now all colors in your document are CMYK.

enter image description here

As advised by the answerer, I had to create this fixup, as my Adobe Acrobat DC Pro lacked it.

closed as off-topic by Wrzlprmft Aug 16 at 6:51

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Your PDF doesn't have embedded color space (no ICC profile attached, no OutputIntent defined) so this error will come out for undefined colorspace objects. But for your particular case it doesn't matter, as you want to convert Pantone to default CMYK (probably US SWOP).

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