How to Open two instances of Unity ?

Questions & Answers
1

I would like to open two instances of Unity…As i need to check on two different project settings…But unity not allowing me to open two instance and gives me a fatal error…

I checked on many ways suggested like opening Unity from Taskbar, or give the properties of Unity icon like ""C:\Program Files\Unity\Editor\Unity.exe"-.projectpath".

I tried all of them and none is working for me…

Is there any other way available ??

Please help :frowning:

3

In menu Edit → Preferences

and in the dialog box, General tab, tick on the “Always show project wizard” check box.

note that you cannot open 2 instance of the same project, but you can run two different projects.

if you want to check a multiplayer game or something go with @Berenger’s solution by creating multiple instances, even there note that you should use different ports to connect for each exe.

4

These methods will all do what you are trying to do:

  • enable “Always show project wizard”, as @flamy proposed. will always open wizard.
  • use "C:\Program Files\Unity\Editor\Unity.exe" -projectPath to start your editor. will always open wizard.
  • to run different versions of Unity on corresponding projects of that version (which may be incompatible with other versions, for example 3.4/3.5), install the editor twice, in different locations. note you must always open your projects via the wizard then, to prevent Unity from trying to re-open your previous project and convert it (after a warning dialog).
  • after klicking the launcher icon, immediately keep the Alt key pressed (probably Meta on Mac?). will launch project wizard just this once.
2

Unless you need the editor, you can open two exe built by Unity.

5

I know this is an old thread but this will always be a good answer:

good luck!