Anne-Sophie Pedron 

I'm afraid you'll have a bigger problem even if you can install it because you will not be able to licence it:

https://gateway.sdl.com/apex/communityknowledge?articleName=000007331

2014 is no longer supported at all and this includes licensing.  So if you lose the ability to use the licence you already have on your computer then you won't be able to reset it any more... moving to a new computer will not be possible.

Anne-Sophie Pedron 

I'm afraid you'll have a bigger problem even if you can install it because you will not be able to licence it:

https://gateway.sdl.com/apex/communityknowledge?articleName=000007331

2014 is no longer supported at all and this includes licensing.  So if you lose the ability to use the licence you already have on your computer then you won't be able to reset it any more... moving to a new computer will not be possible.

Thanks a lot for your answer: it does not solve my problem, but at least it explains it!
Have a nice day!