If ArcGIS Pro is crashing while opening the VTPK, there isn't anything you can do. I'd submit that to Esri Tech Support (or your Distributor if not in the USA).
As for what you're trying to do: extract contours from the VTPK to perform some analysis... you aren't going to have a lot of luck doing this. I'd head back to where ever you got the VTPK from and ask them for the source data either as a SHP, or fGDB, or some other spatial format. Vector Tiles are meant to visual the data; think of them as a conversion of the data. Some level of generalization happens to vector tiles (I think that the generalization is done on the client, but its very well possible that the generalization is baked into the VTPK data itself. Meaning, the 1m contours might not actually be 1m contours inside the package). There is no tool inside ArcGIS Pro to convert VTPK into "Data" that tools can make use of. (Other software packages may do this, but Pro, and specifically Extract Package will not turn the contents of VTPK into shp or fGDB data).
Note: You can try 7zip to try extracting the package, however, the contents of the package will not have data in a format like shapefile.