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Solution is at adobe kb Adobe Acrobat and Reader Updating and Deployment Information Page created 2009-06-25. In regards to 8.1.6, this problem is discussed on adobe forums at Acrobat 8.1.6 Patch Issues thats where I found the link to be kb page. The kb page gives an explanation, and solutions for acrobat 9 and 8 and 7, professional and reader. The solution is different depending on whether you are willing to create a new admin install point, or deploy updates to user systems. Both are discussed on that page. Briefly: For admin install point, start fresh, use correct sequence, which skips over "security" patches and only uses "quarterly" (cumulative) patches. For Acrobat 8, for example, use 8.0.0 > 8.1.0 > 8.1.1 > 8.1.2 > 8.1.3 > 8.1.6. For deploy to user system: You can download all the patches at Downloads - Acrobat for Windows gzr