Problem

can't install mods because of this

Workaround

That DLL is required for paks compressed with Oodle (there are only a handful of them I've run into for DRG). Can you download it manually and place it next to the integrator exe? That way the integrator won't have to fetch it itself.

There are some alternative ways to find the DLL if you search:
MD5: f2db01967705b62aecef3cd3e5a28e4d
SHA1: 4bcc73614cb8fd2b0bce8d0f91ee5f3202d9d624
SHA256: 19452ae1abae65e1305d3818354d4fae7b1200294322f0d9c6d5ddeb7bd9f978
Download and place next to the exe with name oo2core_9_win64.dll and it will get loaded