unzip it in the www sub-directory of EasyPhp. You should then have C:\Program Files (x86)\EasyPHP-5.3.9\www\projectorria
If you get the zip file, just copy it to "C:\Program Files (x86)\EasyPHP-5.3.9\www\projectorria" (with windows file explorer). If you did not get the zip file , it is just easy : go to
projectorria.toolware.fr/index.php/menu_download_en page (with your brower), right click on the last stable release link "V2.2.3", as select "save target as" (or equivalent, it depends on the browser) and select to save in directory "C:\Program Files (x86)\EasyPHP-5.3.9\www\". Wait until download is finished.
Then open the Windows file explorer and go to "C:\Program Files (x86)\EasyPHP-5.3.9\www\". You will see file projectorriaV2.3.0.zip. Right click on the file, and select "extract here".
Does it mean that you need a constant internet connection to work on Project'or RIA?
No, not if you use it locally. But the power of Project'Or RIA is that is is collabiorative : data is share between all users ; for this you need to share the access through a network (your enterprise network, or the internet).
Just try the demo (log in as invité/invité), you'll see if it's worth the effort to have it run on your own.