an improvement to the code. save as .py

[fireheart2008]

Make sure you have the required libraries installed:
pip install requests tqdm img2pdf

import requests
import os
from concurrent import futures
from tqdm import tqdm
import time
import json
import img2pdf
import shutil
from datetime import datetime

EMAIL = "add email here"  # Replace with your email
PASSWORD = "add password here"        # Replace with your password
OUTPUT_DIR = "D:\\downloads"
RESOLUTION = 0  # Highest resolution
MAX_THREADS = 50

def display_error(response, message):
    print(message)
    print(response)
    print(response.text)
    exit()

def get_book_infos(session, url):
    r = session.get(url).text
    infos_url = "https:" + r.split('"url":"')[1].split('"')[0].replace("\\u0026", "&")
    response = session.get(infos_url)
    data = response.json()['data']
    title = data['brOptions']['bookTitle'].strip().replace(" ", "_")
    title = ''.join(c for c in title if c not in '<>:"/\\|?*')
    title = title[:150]
    metadata = data['metadata']
    links = []
    for item in data['brOptions']['data']:
        for page in item:
            links.append(page['uri'])

    if len(links) > 1:
        print(f"[+] Found {len(links)} pages")
        return title, links, metadata
    else:
        print(f"[-] Error while getting image links")
        exit()

def login(email, password):
    session = requests.Session()
    session.get("https://archive.org/account/login")
    
    data = {"username": email, "password": password}
    response = session.post("https://archive.org/account/login", data=data)
    
    if "bad_login" in response.text:
        print("[-] Invalid credentials!")
        exit()
    elif "Successful login" in response.text:
        print("[+] Successful login")
        return session
    else:
        display_error(response, "[-] Error while login:")

def loan(session, book_id, verbose=True):
    data = {
        "action": "grant_access",
        "identifier": book_id
    }
    response = session.post("https://archive.org/services/loans/loan/searchInside.php", data=data)
    data['action'] = "browse_book"
    response = session.post("https://archive.org/services/loans/loan/", data=data)

    if response.status_code == 400:
        if response.json()["error"] == "This book is not available to borrow at this time. Please try again later.":
            print("This book doesn't need to be borrowed")
            return session
        else:
            display_error(response, "Something went wrong when trying to borrow the book.")

    data['action'] = "create_token"
    response = session.post("https://archive.org/services/loans/loan/", data=data)

    if "token" in response.text:
        if verbose:
            print("[+] Successful loan")
        return session
    else:
        display_error(response, "Something went wrong when trying to borrow the book, maybe you can't borrow this book.")

def return_loan(session, book_id):
    data = {
        "action": "return_loan",
        "identifier": book_id
    }
    response = session.post("https://archive.org/services/loans/loan/", data=data)
    if response.status_code == 200 and response.json()["success"]:
        print("[+] Book returned")
    else:
        display_error(response, "Something went wrong when trying to return the book")

def image_name(pages, page, directory):
    return f"{directory}/{(len(str(pages)) - len(str(page))) * '0'}{page}.jpg"

def download_one_image(session, link, i, directory, book_id, pages):
    headers = {
        "Referer": "https://archive.org/",
        "Accept": "image/avif,image/webp,image/apng,image/*,*/*;q=0.8",
        "Sec-Fetch-Site": "same-site",
        "Sec-Fetch-Mode": "no-cors",
        "Sec-Fetch-Dest": "image",
    }
    retry = True
    while retry:
        try:
            response = session.get(link, headers=headers)
            if response.status_code == 403:
                session = loan(session, book_id, verbose=False)
                raise Exception("Borrow again")
            elif response.status_code == 200:
                retry = False
        except:
            time.sleep(1)

    image = image_name(pages, i, directory)
    with open(image, "wb") as f:
        f.write(response.content)

def download(session, n_threads, directory, links, scale, book_id):
    print("Downloading pages...")
    links = [f"{link}&rotate=0&scale={scale}" for link in links]
    pages = len(links)

    tasks = []
    with futures.ThreadPoolExecutor(max_workers=n_threads) as executor:
        for link in links:
            i = links.index(link)
            tasks.append(executor.submit(download_one_image, session=session, link=link, i=i, directory=directory, book_id=book_id, pages=pages))
        for task in tqdm(futures.as_completed(tasks), total=len(tasks)):
            pass

    images = [image_name(pages, i, directory) for i in range(len(links))]
    return images

def make_pdf(pdf, title, directory):
    file = title + ".pdf"
    i = 1
    while os.path.isfile(os.path.join(directory, file)):
        file = f"{title}({i}).pdf"
        i += 1

    with open(os.path.join(directory, file), "wb") as f:
        f.write(pdf)
    print(f"[+] PDF saved as \"{file}\"")

def main():
    if not os.path.exists(OUTPUT_DIR):
        os.makedirs(OUTPUT_DIR)

    session = login(EMAIL, PASSWORD)
    urls = []
    
    while True:
        url = input("Please paste the Archive.org book URL (must start with https://archive.org/details/): ").strip()
        if not url.startswith("https://archive.org/details/"):
            print("Invalid URL format. URL must start with 'https://archive.org/details/'")
            continue
        
        urls.append(url)
        
        while True:
            choice = input("Do you want to add another book? (y/n): ").lower()
            if choice in ['y', 'n']:
                break
            print("Please enter 'y' or 'n'")
            
        if choice == 'n':
            break
    
    print(f"\n{len(urls)} Book(s) to download")
    
    for url in urls:
        book_id = list(filter(None, url.split("/")))[3]
        print("="*40)
        print(f"Current book: https://archive.org/details/{book_id}")
        session = loan(session, book_id)
        title, links, metadata = get_book_infos(session, url)

        directory = os.path.join(OUTPUT_DIR, title)
        i = 1
        _directory = directory
        while os.path.isdir(directory):
            directory = f"{_directory}({i})"
            i += 1
        os.makedirs(directory)

        images = download(session, MAX_THREADS, directory, links, RESOLUTION, book_id)

        # Create PDF with metadata
        pdfmeta = {}
        for key in ["title", "creator", "associated-names"]:
            if key in metadata:
                if isinstance(metadata[key], str):
                    pass
                elif isinstance(metadata[key], list):
                    metadata[key] = "; ".join(metadata[key])
                else:
                    raise Exception("unsupported metadata type")
                    
        if 'title' in metadata:
            pdfmeta['title'] = metadata['title']
        if 'creator' in metadata and 'associated-names' in metadata:
            pdfmeta['author'] = metadata['creator'] + "; " + metadata['associated-names']
        elif 'creator' in metadata:
            pdfmeta['author'] = metadata['creator']
        elif 'associated-names' in metadata:
            pdfmeta['author'] = metadata['associated-names']
        
        if 'date' in metadata:
            try:
                pdfmeta['creationdate'] = datetime.strptime(metadata['date'][0:4], '%Y')
            except:
                pass
                
        pdfmeta['keywords'] = [f"https://archive.org/details/{book_id}"]

        pdf = img2pdf.convert(images, **pdfmeta)
        make_pdf(pdf, title, OUTPUT_DIR)
        
        try:
            shutil.rmtree(directory)
        except OSError as e:
            print("Error: %s - %s." % (e.filename, e.strerror))

        return_loan(session, book_id)

if __name__ == "__main__":
    main()

[fireheart2008]

now it becomes a standalone script no need for writing any code in the terminal. just paste the links