ufpi buying advice please

[bbadmin]

If I get silver I will need the jtag activation

No need.

mcu acitvation to proceed as well

https://mslw.com/ufpi/licenses/

And I will need chip mount activation, yes ?

Only you know.

And what does file mount activation mean, I don't  understand that one and when would I need it.

Mount linux FS like ext4 for working in the file manager. Also possible mount directly on chip, NAND UBIFS, etc.