Adobe stopped selling XI a couple of years ago, as soon as DC was released. You have to ask yourself, where do all these copies of discontinued software keep coming from? Sadly, all too often, they are counterfeits, which could well come with an added dose of malware.
But your original question has two big mistakes in it. This is not your fault, it is entirely Adobe marketing's fault. These mistakes are costing them dear, I believe.
1. "don't see the need for the "cloud" application of this at this time" Acrobat DC is just the newest version of Acrobat, software you install and run locally. It has the option of saving to the web, but it isn't web software (better known as SaaS). Adobe chose the word "Cloud" mainly because it sounded exciting and the sort of thing everyone would want.
2. "I don't want to [get] into monthly subscriptions"-- then don't. You can still buy an upgrade license, though the version is old and frozen, it's still DC and still supported. (XI goes out of support in a few months). Acrobat is almost alone among Adobe apps. Most of the others are now subscription only. And Adobe goes to some trouble to hide the purchase/upgrade option on their web site.
AdChoices