无网络环境下安装Python后缺失api-ms-win-crt-runtime-l1-1-0.dll的解决方法

Hey there, let’s work through this DLL issue step by step—since both computers are offline, we’ll stick strictly to fixes that don’t require internet access. I’ve helped troubleshoot this exact problem dozens of times, so let’s start with the most likely culprits:

1. Double-Check Visual C++ Redistributable Architecture (32-bit vs 64-bit) #

Mismatched architecture is the #1 reason this fix fails even after reinstalling the redistributable:

• If you installed a 64-bit Python, make sure you’re using the 64-bit version of Visual C++ Redistributable for Visual Studio 2015 (and vice versa for 32-bit Python). It’s easy to grab the wrong installer without noticing.
• First, uninstall all existing "Microsoft Visual C++ 2015 Redistributable" entries from Control Panel > Programs > Programs and Features. Restart the computer, then reinstall the correct architecture version.

2. Repair the VC Redistributable Installation #

Even a fresh install can leave corrupted registry entries or partial files. Try repairing it:

• Run the VC Redistributable installer again. Instead of clicking "Install", look for the Repair option (it should appear if the package is already installed). Let it run, then restart your machine.

3. Manually Register the DLL (Admin Rights Required) #

If the DLL exists on your system but isn’t registered properly, this can fix it:

1. Confirm the DLL’s location:
   • 64-bit system + 64-bit Python: C:\Windows\System32\api-ms-win-crt-runtime-l1-1-0.dll
   • 64-bit system + 32-bit Python: C:\Windows\SysWOW64\api-ms-win-crt-runtime-l1-1-0.dll
   • 32-bit system: C:\Windows\System32\api-ms-win-crt-runtime-l1-1-0.dll
2. Open Command Prompt as Administrator.
3. Run the appropriate command for your setup:

   # For 64-bit system + 64-bit Python
   regsvr32 "C:\Windows\System32\api-ms-win-crt-runtime-l1-1-0.dll"
   
   # For 64-bit system + 32-bit Python
   regsvr32 "C:\Windows\SysWOW64\api-ms-win-crt-runtime-l1-1-0.dll"
   
   # For 32-bit system
   regsvr32 "C:\Windows\System32\api-ms-win-crt-runtime-l1-1-0.dll"
   

4. You’ll get a confirmation message if registration succeeds. Restart and test Python again.

4. Install Required Windows Offline Updates #

The api-ms-win-crt-runtime DLL is part of the Windows Universal CRT, which sometimes needs system-level updates:

• For Windows 7/8.1: Grab the offline package for KB2999226 from an internet-connected machine, transfer it to your offline computers, install it, and restart.
• For Windows 10: Ensure you have the latest cumulative update (offline package) installed—this usually includes the necessary CRT components.

5. Clean Python Reinstallation #

If all else fails, wipe Python completely and start fresh:

• Uninstall Python from Control Panel.
• Delete leftover folders like C:\PythonXX or C:\Users\<YourUsername>\AppData\Local\Programs\Python.
• Reinstall the exact architecture version of Python that matches your VC Redistributable.

I’ve found that 9 times out of 10, either the architecture mismatch or missing KB2999226 update is the root cause. Start with those steps on both machines—they’re quick and often resolve the issue right away.

内容的提问来源于stack exchange，提问作者cydia