Install catia V5 R21 64 bit on windows 10

Hello 

I don't want to install  catia V5 R21 64 bit on windows 10 , ? is this normal 

Hello R21 it's old.

To see 

compatibility-enoviacatia-on-windows.

 

Hello, and for example can CATIA R2016 read a file that comes from normal Catia v5 R21? 

Yes, in that sense, no problem.

In the other one there is a downgrad utility in the lower version but we lose the specification tree.

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