"In an odd situation like this, what would happen if I just download from your link without uninstalling? "
The V11 setup automatically uninstalls any 9 or 10 version and replaces it
Any earlier version is left untouched - you then end up with two versions on the system - not the best situation
Re your problem - remember Adobe works on a system of font embedding, or in some cases font approximation / substitution. That may possibly be the issue. What font did you use?