Close settings, then again open settings and check the box back uncheck the associate with NXM URLs then check it again.Go back to the “ Settings“, and uncheck the “ Associate with NXM URLs” (if it’s already checked).Right-click on the NMM shortcut icon and choose “ Run as Administrator“.If this is grey out, close the Nexus Mod Manager If the option is grey and can’t click, close the manager.In the General tab at the top, you will see “ Associate with NXM URLs“.Open “ Nexus Mod Manager” by double-clicking the shortcut and go to “ Settings“.Sometimes this particular option will be the bug for the problem and not letting manager communicate with nexus URLs that you are trying to download. This method is focused on the settings of Nexus Mod Manager where you will find the option about associate with nxm URLs. Now that you know what is causing this issue, let’s move towards the methods that will help you resolve this problem. An option for nxm must not be selected or selected wrong due to which the manager is not able to download any of the mod files. Browser Settings: The second reason this can happen is because of your browser settings for the nxm.This bug happens because of the manager not associating with the nxm URLs and is unable to accept any of the download file links. Nexus Mod Manager Settings Bug: Mostly this issue is caused by the Manager settings.
