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@bujalarab
I did it a year and a half ago with Tiagra 4700. Went from 11-34 to 11-40(Sunrace) using the D-link. I fully used a 116 links kmc chain.
I think D link is a good option. One thing, Tiagra derailleur seems rather long(at least on my Genesis) but as I much as I figure it out I could have done the change with-out Dlink providing that I would stay away from the largest 4 cogs in combination with the 50T chainring.
I guess if your derrailler is a short one you would still be able to do it avoiding large-large combinations. However the 42T might be too large.
With D-link in the 50 to 40 combination the derailleur was quite streched and I stayed away from it, as under load I suspected that the chance of snaping would be very high.
Recently I change the chairing from 50/34 to 40/24, as I am really poor with hills and to my shame I am not that old.
A quick search on youtube will give you quite a lot of videos about this. If I remember right, at the time whent I did it, there was one with 105.