I downloaded the OpenStudio-2.5.0 Windows installer. When double clicking to start the installation, the install script fails during pat installation with an error :7z not enough memory. I redid the install twice, same results.
Then I used right click, run as Administrator and the installation was successful.
I have lots of hard drive space, and 7.88 GB usable RAM. Paging file size is 8072 MB. So no actual question but a report.