Problem with list_revisions and revision download of very old files

I am using REAT API method using Rebex HTTP product without SDK.

Below is part of packet capture using Fiddler.
Please refer to it.

List Revisions

POST https://api.dropboxapi.com/2/files/list_revisions HTTP/1.1
Host: api.dropboxapi.com
Authorization: Bearer <token>
Content-Type: application/json
Content-Length: 62
User-Agent: <myagent>
Connection: keep-alive

{"path":"id:77F-LgoKhIQAAAAAAAAZlw","mode":"path","limit":100}

HTTP/1.1 200 OK
Content-Type: application/json
Cache-Control: no-cache
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-Server-Response-Time: 118
Date: Tue, 08 Jul 2025 00:40:45 GMT
Server: envoy
Content-Length: 2811
Vary: Accept-Encoding
X-Dropbox-Response-Origin: far_remote
X-Dropbox-Request-Id: ce74745399564b4d91edd0de4fc171d7

{"is_deleted": false, "entries": 
[
{
"name": "\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"path_lower": "/a7/\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"path_display": "/a7/\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"id": "id:77F-LgoKhIQAAAAAAAAZlw", 
"client_modified": "2024-01-07T01:44:16Z", 
"server_modified": "2024-01-07T01:49:25Z", 
"rev": "60e514a7f46482112719d", "size": 13, 
"is_downloadable": true, 
"content_hash": "..."
},
{
"name": "\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"path_lower": "/a7/\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"path_display": "/a7/\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"id": "id:77F-LgoKhIQAAAAAAAAZlw", "client_modified": "2024-01-07T01:44:22Z", 
"server_modified": "2024-01-07T01:43:48Z", 
"rev": "60e51366ff7b62112719d", 
"size": 32, 
"is_downloadable": true, 
"content_hash": "..."
},
{
"name": "\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"path_lower": "/a7/\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"path_display": "/a7/\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"id": "id:77F-LgoKhIQAAAAAAAAZlw", 
"client_modified": "2024-01-07T01:44:19Z", 
"server_modified": "2024-01-07T01:43:45Z", 
"rev": "60e51363beb102112719d", 
"size": 22, 
"is_downloadable": true, 
"content_hash": "..."
},
{
"name": "\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"path_lower": "/a7/\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt",
"path_display": "/a7/\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"id": "id:77F-LgoKhIQAAAAAAAAZlw", 
"client_modified": "2024-01-07T01:44:16Z",
"server_modified": "2024-01-07T01:43:42Z", 
"rev": "60e51360b149e2112719d", 
"size": 13, 
"is_downloadable": true, 
"content_hash": "..."
},
{
"name": "\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"path_lower": "/a7/\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"path_display": "/a7/\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"id": "id:77F-LgoKhIQAAAAAAAAZlw", "client_modified": "2024-01-07T01:44:11Z", 
"server_modified": "2024-01-07T01:43:37Z", 
"rev": "60e5135ca17b62112719d", 
"size": 5, "is_downloadable": true, 
"content_hash": "..."
},
{
"name": "\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"path_lower": "/a7/\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"path_display": "/a7/\uc0c8 \ud14d\uc2a4\ud2b8 \ubb38\uc11c.txt", 
"id": "id:77F-LgoKhIQAAAAAAAAZlw", 
"client_modified": "2024-01-07T01:41:30Z", 
"server_modified": "2024-01-07T01:41:30Z", 
"rev": "60e512e35dae52112719d", 
"size": 0, 
"is_downloadable": true, 
"content_hash": "..."
}
], "has_more": false}

Download Revision

GET https://content.dropboxapi.com/2/files/download HTTP/1.1
Host: content.dropboxapi.com
Authorization: Bearer <token>
Dropbox-API-Arg: {"path":"rev:60e51360b149e2112719d"}
User-Agent: <myagent>
Connection: keep-alive

HTTP/1.1 409 Conflict
Content-Type: application/json
Cache-Control: no-cache
Content-Disposition: attachment; filename=unspecified
Content-Security-Policy: sandbox
Content-Security-Policy: sandbox allow-forms allow-scripts
Vary: Dropbox-API-Arg, Authorization
X-Content-Security-Policy: sandbox
X-Content-Type-Options: nosniff
X-Webkit-Csp: sandbox
Date: Tue, 08 Jul 2025 00:40:52 GMT
Server: envoy
Content-Length: 95
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
X-Robots-Tag: noindex, nofollow, noimageindex
X-Dropbox-Response-Origin: far_remote
X-Dropbox-Request-Id: e633795cd924465ba3021b960705bed5

{"error_summary": "path/not_found/.", "error": {".tag": "path", "path": {".tag": "not_found"}}}