You Do Need power plug adapter while traveling from Liechtenstein to Bolivia.

Here is Why You Need An Adapter

The outlet and plug type used in Bolivia are A and C and in Liechtenstein are C and J. This is how they look like.

Liechtenstein

In Liechtenstein, outlets of type C and J are in use.

Type C

Type J

Bolivia

In Bolivia, outlets of type A and C are in use.

Type A

Type C