With the online services that were shut down on October 1, 2022, you no longer have acces to DLCs. But fear not, with this guide you can have unlock them, without Uplay.

The following "patch", comes with some extra benefits, besides the DLCs, like for example:

+Unlocked multisampling on high resolutions.
+Added support of all XInput controllers.
+Added detection of hotplugged controllers.
+Gamepad and kb/mouse controls work at the same time.
+Added ini setting for enabling PS3-like controls.
+Added ini setting to skip intro videos.
+[DX10 only] Fixed doubling of resolution modes in settings.
+Options configurable in .ini file.

The only "downside" is this (but, don't worry, I have the solution for this "problem", as well):

-Removes support of DirectInput controllers. Use of a DirectInput to XInput translator such as XOutput(https://github.com/csutorasa/XOutput) is recommended if using a DirectInput only controller.

Now, let's get down to the business:

Here's the download link: https://github.com/Sergeanur/EaglePatch/releases/download/v1.0/EaglePatchAC1.rar

How to install it:
1.Download Ultimate ASI Loader: https://github.com/ThirteenAG/Ultimate-ASI-Loader/archive/refs/heads/master.zip
2.Put dinput8.dll from Ultimate ASI Loader into your Assassin's Creed: Director's Cut Edition directory
3. In your Assassin's Creed: Director's Cut Edition directory create a folder named scripts
4.Put EaglePatchAC1.asi and EaglePatchAC1.ini into a newly created scripts folder
5.Done! You may want to check EaglePatchAC1.ini for any settings you want to enable or disable

All the credits goes to the owner and the creator of this amazing patch.

If you have some issues with the game, please feel free to check, PCGamingWiki: https://www.pcgamingwiki.com/wiki/Assassin%27s_Creed