Reinstalled eM Client, all subfolders are missing, all old emails missing too

Dear All.

I’ve just set up an eM Client, didn’t make any reserved copy earlier, unfortunately.
Now, all sub folders and emails are gone.

Is there any possibility to restore them?
Tysm in advance.

OS version?
eMC version.
How did you install eMC (via MS or the eMC website)
When you say “I’ve just set up an eM Client, didn’t make any reserved copy earlier, unfortunately.” what do you mean?