Bulk Image Downloader extension don't see installed program in Sandboxie

I'am using ungoogled chromium and run it sandboxed on win7x64 pc. I installed bulkimage downloader in sandboxieplus (latest version) and run normally some browser extension like ublock, cookie auto delete, decentraleyes etc, but when I installed bulkimage downloader extension - it can be started by button on toolbar or with right click on any given page I got pop up saying that (it is a long one), but on the bottom it stated the following:

Access to the specified native messaging host is forbiden

and basically when I click Ok it send me to web site to download application (which is already installed and working). Obviously extension can't see installed application in sandboxie.

I installed application and extension on normal operating system and everything works fine. How can I make it to work (extension)? Thanks