Do I still own this?

[MoToad]

Many years ago I owned DCS Blackshark. Is there any way of getting it back without paying again?

[Sh4rk]

You need this

https://www.digitalcombatsimulator.com/en/shop/modules/dcs_black_shark_2_upgrade/

 

If you can't buy / acquire it through the store, maybe you can ask ED support.