もちろん、ここに複数のCSVファイルを処理できるようにコードを修正したバージョンがある：

```
import csv
import requests
import tkinter as tk
from tkinter import filedialog
from tkinter import messagebox

def process_csv(csv_file, output_path):
    with open(csv_file, "r") as file:
        reader = csv.reader(file)
        header = next(reader) # skip the header row
        for row in reader:
            name, url, rating = row
            response = requests.get(url)
            if response.status_code == 200:
                subfolder = output_path + "/" + rating
                if not os.path.exists(subfolder):
                    os.makedirs(subfolder)
                file_path = subfolder + "/" + name + ".png"
                with open(file_path, "wb") as f:
                    f.write(response.content)
            else:
                messagebox.showerror("Error", f"Failed to download {name} from {url}")

def select_csv():
    csv_file = filedialog.askopenfilename(initialdir = "/", title = "Select CSV file", filetypes = (("CSV files", "*.csv"), ("all files", "*.*")))
    if csv_file:
        return csv_file

def select_output_path():
    output_path = filedialog.askdirectory(initialdir = "/", title = "Select output path")
    if output_path:
        return output_path

root = tk.Tk()
root.withdraw()
csv_file = select_csv()
if csv_file:
    output_path = select_output_path()
    if output_path:
        process_csv(csv_file, output_path)
        messagebox.showinfo("Success", "Processing completed")
```
Sure, here's a modified version of the code to allow for processing multiple CSV files:

import csv
import requests
import tkinter as tk
from tkinter import filedialog
from tkinter import messagebox

def process_csv(csv_file, output_path):
    with open(csv_file, "r") as file:
        reader = csv.reader(file)
        header = next(reader) # skip the header row
        for row in reader:
            name, url, rating = row
            response = requests.get(url)
            if response.status_code == 200:
                subfolder = output_path + "/" + rating
                if not os.path.exists(subfolder):
                    os.makedirs(subfolder)
                file_path = subfolder + "/" + name + ".png"
                with open(file_path, "wb") as f:
                    f.write(response.content)
            else:
                messagebox.showerror("Error", f"Failed to download {name} from {url}")

def select_csv():
    csv_file = filedialog.askopenfilename(initialdir = "/", title = "Select CSV file", filetypes = (("CSV files", "*.csv"), ("all files", "*.*")))
    if csv_file:
        return csv_file

def select_output_path():
    output_path = filedialog.askdirectory(initialdir = "/", title = "Select output path")
    if output_path:
        return output_path

root = tk.Tk()
root.withdraw()
csv_file = select_csv()
if csv_file:
    output_path = select_output_path()
    if output_path:
        process_csv(csv_file, output_path)
        messagebox.showinfo("Success", "Processing completed")