I placed it and the game crushed:

Error while running event quality-condenser::on_robot_built_entity (ID 17)
value for required parameter 1 (inventory_index) is missing
stack traceback:
[C]: in function 'newindex'
__quality-condenser/scripts/combinators.lua:18: in function 'create_for_struct'
quality-condenser/control.lua:284: in function <quality-condenser/control.lua:210>

Also, It asks me to install version 2.0.48, I don't know if I missed something, but I think the .47 is the last official one...

switch to the experimental branch or follow the instructions linked in one of the other recent threads.