It is not possible to install the APS Application in the Document Root folder of the IIS Webspace, e.g. to http://domain.tld/ instead of http://domain.tld/sub-directory/, the following message is shown in CCP if you try to do it:
URL path on IIS website can not be empty or point to the root directory, can contain Latin characters, digits, hyphens, dots, underlines and single slashes as separators
However, it is possible to change the URL to / after installation using
Change URL path button. Is it correct behavior?
The issue has been reported to the development team as APS-12613: path could be changed to root (/) for APS application already installed in IIS webspace.
The ability of changing URL to / will be disabled in future versions of OA.