NASTools Transmission NT 2.92-nt2 rpc folder

Had to rebuild NAS with new HDDs (ref my other posts).  Initially had issues getting apps re-installed but got that solved with help of community.

However, cannot get Transmission NT app to work.  Was working perfectly for years on old setup.  Copied previous settings.json file across (with Transmission service stopped).  Using same password as previously for NAS.  HTTPS enabled (Port 443).  Restart service (says it's started).  When I try to connect via Transmission Remote GUI (v 5.02 - which I was using previously without any issues) I get error:

NOT FOUND
The requested URL /apps/nastools-transmission/rpc was not found on the server.

rpc settings in json file:

    "rpc-authentication-required": false,
    "rpc-bind-address": "0.0.0.0",
    "rpc-enabled": true,
    "rpc-password": "{7d334fd6c23c25e2e9e90eda15284d3e0857666b9hfu3o7L",
    "rpc-port": 9201,
    "rpc-url": "/apps/nastools-transmission/rpc",
    "rpc-username": "",
    "rpc-whitelist": "127.0.0.1,192.168.1.2",
    "rpc-whitelist-enabled": true,

I checked my old setup and there wasn't an rpc folder either and it ran no problem at all.  So I'm perplexed.  Same settings.json file and now can't connect via GUI.  Have added my PC IP address to the Whitelist and can bring up web interface on port 9201 but also get rpc cannot connect server error same as Remote GUI.

Any thoughts?