We do not offer the option to change the install location. The reason is that too many users choose unsuitable locations, such as removable drives. For power users it is still possible to override by extracting the MSI and setting the parameter there.
This issue is a somewhat related to this post https://www.axcrypt.net/forums/topic/silent-installation/ .
The basic command is MSIExec /i [path_to_and_name_of_MSI] INSTALLDIR=”[required_installation_folder_goes here]” [other arguments] . Google msiexec for more details.