There are two scenarios to avoid in the future to have the manual installation bulletproof:
missing Platform/BlackBerry folder at all (in that case Visual Studio fires LOTs of strange errors, when trying to Import or open project)
incompatible versions between package and MSBuild (that could show up in next releases; and potentially might lead to build instabilities, when new fields are added etc)
There are two scenarios to avoid in the future to have the manual installation bulletproof: