Okay, I've managed to install an older version (Revit 2013) with the help of a guy from the tech department and got it working, although it downloads a lot of data from internet (what took hours on my mobile connection... what's wrong with these Autodesk installers? It's almost impossible to try a software) it's working properly now.
The Aligned dimension really works pretty well. However, the line doesn't snaps to the other when I'm rotating it (all snaps are on). Maybe it's because it's the 2013 version? Anyway, making a circle and snapping on the intersection isn't that bad (in fact I find it easier than rotating the line).
Revit seems quite good, however, it seems it's not sold as stand-alone product, you have to acquire a bundle with many other softwares (AutoCAD, AutoCAD Architecture, AutoCAD MEP, AutoCAD Detailing, AutoCAD Raster Design, Showcase, Sketchbook, ReCap, 3Ds Max, Navisworks) and I don't find it a good deal. If there were a Revit-only bundle (with all Revit versions) and maybe some 'Graphical' programs like 3Ds Max and Sketchbook (that we could use eventually (at the moment the Art D. is using Maxon and Adobe Products)) I think our company would consider acquiring it, but I'm not even mentioning it because it's not reasonable in my opinion to buy a bundle with 10 softwares you don't want only because of one.
It seems there's no good alternative for MEP besides Autodesk/DDS/Plancal. I'm going to try another softwares but I think there's no other way to go than outsourcing.
I don't understand though why they don't sell it stand-alone or in moderate bundles. Maybe they want to focus only on really big companies. It's not a very smart move in my opinion though. Anyway, I'm going to stick with my current software because Revit is prohibitive at the moment.
Thank you for your help.
