If you go to the command line in your Sage installation (in the virtual machine), how do you launch Sage? Let's say you use the command

```
$ /path/to/sage-4.6/sage
```

to launch Sage. Then all you should have to do is

```
$ /path/to/sage-4.6/sage -i database_kohel-20060803
```

or possibly

```
$ /path/to/sage-4.6/sage -i database_kohel-20060803.spkg
```

It should automatically download, even in the virtual machine.

If not, then you'd have to move the spkg to the VM filesystem somehow (I'm not sure how that's done, but should be Googleable) and then do

```
$ /path/to/sage-4.6/sage -i /path/to/database_kohel-20060803.spkg
```

If you only have the notebook, you should be able to do

```
install_package(package='database_kohel-20060803')
```

Try

```
install_package?
```

for more information. See this Sage documentation page as well.