Most of our software products are available in two editions: Installer and Portable
Installer is an application packaged into an installation program (setup wizard). The installer places the application into a specific folder, customarily into "Program Files (x86)", creates shortcuts and adds an uninstaller. The installer may also register file associations and extra components in the system to enable additional functionality of the application. Installer usually requires administrator privileges.
Vovsoft installers are built using Inno Setup, a popular open-source tool for creating Windows installation packages.
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Portable application can be placed in any folder on your computer, a USB flash drive or other removable media and launched from there. Portable software creates configuration files in its folder and generally doesn’t change anything in the system it runs on. If you copy the configuration files together with the executable file to another media, all your settings will be carried across too.
Unless you have specific reasons to use the portable edition, it is best to use the installer to get the best of what the software has to offer.
No, they are not sold separately. A single purchase gives you access to both the installer and portable editions. You can install the software on your computer for everyday use, and also keep the portable version on a USB flash drive for use on other machines. This flexibility allows you to use the software wherever you need it, without paying twice.
Installed applications don't have access to write in the Program Files directory. So, they usually store their settings and temporary files in the AppData folder.
Example:
Portable programs, on the other hand, don't use the AppData folder. They use the folder of the main executable file.
⚠️ An important detail to note here is that if you run an installed program with administrator privileges, it gains the ability to write to the Program Files folder. Therefore, when run as administrator, it can write its settings and temporary files to its folder inside Program Files.