What option to choose.

[jenya7]

I installed Qt on a new machine (64-bit). When I open an existing project the window pops up

What option should I choose?

[JonB]

@jenya7
Do you mean we should know whether you wish to use MSVC 2019, MSVC 2017 or MinGW? Surely only you know which compiler you want? If it's an existing project, what did you use wherever you had it previously?

[jenya7]

@JonB
It was MinGW but I had this option only. I don't understand the difference between MSVC and MinGW. I mean is there some consideration what preferable to use?

[JonB]

@jenya7
Well they are two different compiler toolchains. MinGW is the Windows version of the Linux gcc compiler/linker, MSVC is the Microsoft compiler/linker used from Visual Studio. If you previously used MinGW I don't know why you would want to change from that.

[jenya7]

@JonB
Thank you. Now it's more clear to me.