The best and easiest way is to use the Combo 10.6.8 Updater. It will install all the incremental updates in one fell swoop. Of course, there will still be updates to specific things but do the Combo first and then use Software Update for everything else.
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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