Missing D3D12Core.dll (Thanks to Dresk on the Steam Forums)
Search on your PC for the following file: C:\Windows\system32\D3D12Core.dll
If you do not have this file, Windows Update failed to install it, or your windows is out of date. If you are out of date on Windows 10, please run windows update. After it’s completed, look for the file above. If that is still missing, you will need to download a windows update to install Agility on your system.
To find out what version of windows you have, type winver in the windows search bar or hold down the Windows Key, pressing R, and typing winver in the box that pops up (followed by enter.)
The 2nd line will say “Version” followed by your installed version of Windows.
If you have 2004 or 20H2, use this link: : https://www.catalog.update.microsoft.com/Search.aspx?q=KB4601319
On this page, you want the update for 2004, for x64 (64bit), cumulative update, non-server version. On the page that update has this exactly for the line :
2021-02 Cumulative Update for Windows 10 Version 2004 for x64-based Systems (KB4601319)
If you have 20H2, look for this line :
2021-02 Cumulative Update for Windows 10 Version 20H2 for x64-based Systems (KB4601319)
AMD GPU Users(Thanks to Cupcake and Chaoz)
This error is related to outdated/incorrect drivers.
If you are on legacy, use these versions:
-21.4.1 - https://www.amd.com/en/support/kb/release-notes/rn-rad-win-21-4-1
-21.5.2 - https://www.amd.com/en/support/kb/release-notes/rn-rad-win-21-5-2
If you are not legacy, use:
-23.7.1 - https://www.amd.com/en/support/kb/release-notes/rn-rad-win-23-7-1
After installing, you may be told you need to update the drivers, choose “No”.