Вам нужно сначала нажать на ссылку экспорта, чтобы увидеть элемент списка, затем вы можете нажать на ссылку CSV. Добавьте две строки после нажатия на поиск.
#Click on Export link
WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//a[@class='darkorange dropdown-toggle' and contains(.,'Export')]"))).click()
#Click on csv link
WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//ul[@class='dropdown-menu']//li//a[contains(.,'csv')]"))).click()
Полный блок кода.
from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
driver=webdriver.Chrome()
driver.get("http://e-licitatie.ro/pub/notices/contract-award-notices/list/3/1")
WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//button[@class='pull-right btn btn-default']"))).click()
WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//input[@placeholder='De la data']"))).send_keys("31/03/2020")
WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//input[@placeholder='Pana la data']"))).send_keys("01/04/2020")
WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//button[@class='pull-right margin-left-5 btn btn-entity']"))).click()
WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//a[@class='darkorange dropdown-toggle' and contains(.,'Export')]"))).click()
WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//ul[@class='dropdown-menu']//li//a[contains(.,'csv')]"))).click()