Ever since I downloaded version 5.5.2 - the monodevelopment doesn’t recognize Unity’s libraries, and it’s structs.

You can see how everything is red…
Can anyone tell me how can I fix that, or do I need to write my scripts blindly? I’m new to C#, and Unity, and this is kind a demotivating

I had this problem a while ago aswell, if you open the unity editor and go to Edit>Preferences and select the “External Tools” tab you should see a field saying “External scrip editor” with “Monodevelop (built-in)” selected.
Change it by pressing “browse” from it’s drop-down menu and manually select monodevelop (located in your unity install directory.)

I don’t know what could be the cause of the problem but as said, it worked for me so let’s hope it work for you too!

I did what you said, but it didn’t help. I even tried to move the Monodevelop folder inside the Unity folder, but still the same

EDIT: okay, I incidentally found out what was wrong. I right clicked on “Assembly-CSharp” (on the left of the screen), went to options > general, and changed the “Mono / .NET 3.5” to “Mono / .NET 4.5” and it started working (the 3.5 was not found)