You can disable OAuth 2.0 authentication from the client side using the following registry key: 

NOTE:

Use this option when you cannot disable the OAuth 2.0 authentication at the server side.

Location: HKEY_CURRENT_USER\Software\iManage\Work\10.0\Client\login

OR

HKEY_LOCAL_MACHINE\Software\iManage\Work\10.0\Client\login

If the  AllowOAuth2 key is specified under both HKEY_CURRENT_USER and HKEY_LOCAL_MACHINE, then settings in HKEY_CURRENT_USER are applied. 

Name: AllowOAuth2
Type: REG_DWORD
Value:

  • 0: Disabled (default)
  • 1: Enabled