Hi,
This is not a message from Wampserver installer.By default, Wampserver install path are : "c:\wamp" for 32bit or "c:\wamp64" for 64 bit.
My installations of Wampserver are :
j:\wamp and j:\wamp64 for Windows 7
e:\wamp and e:\wamp64 for Window 10
In the Destination dialog of the installer just put the correct path you want before validate Next.
Nevertheless, it is well specified in the prerequisites, that it is preferable to install Wampserver at the root of a disk or partition, so: c:\wamp64\ or d:\wamp64\ or z:\wamp64\
and that we must avoid paths with spaces, so avoid c:\Program Files\ or c:\Program Files (x86)\ because spaces are the parameter separators in the Apache or PHP command lines.
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Wampserver install files & addons