If you launch the mod on the newest 2.1 experimental Steam branch, you will hit the following error:

"Failed to load mods: Error while loading entity prototype "chcs-solar-power-tower" (reactor): FluidBox minimum_temperature and maximum_temperature have been removed. Similar properties have been added to most machine prototypes.

At ROOT.reactor.chcs-solar-power-tower.energy_source.fluid_box
Modifications: Cheese's Concentrated Solar
Mods to be disabled:
• ch-concentrated-solar (0.6.0)"

Fix (prototypes/solar-power-tower.lua, Factorio 2.1): FluidBox::minimum_temperature was removed and FluidEnergySource::minimum_input_temperature replaces it. Move the limit from the fluid box up to the energy source:

energy_source =
{
type = "fluid",
fluid_box = {
volume = data_util.solar_max_temp,
pipe_connections = {},
production_type = "input",
filter = data_util.mod_prefix .. "solar-fluid"
},
minimum_input_temperature = 10.0,
...