VST installers should ‘remember’ the location used to install the plugins.
So when updating or reinstalling that the default location for the installation of the VST is in the previous location.
This is easy to do, numerous other plugin installers do it and I’ve done it for the programs I’ve created. For Windows installers – one way is to store the location in the system Registry.
As someone who owns a fair number of your plugins having to change the both the 32 & 64 bit locations for every plugin I’m updating is a pain.