diff --git a/admin/app/services/collection_update_service.ts b/admin/app/services/collection_update_service.ts
index ea497b2..5ae7521 100644
--- a/admin/app/services/collection_update_service.ts
+++ b/admin/app/services/collection_update_service.ts
@@ -120,7 +120,6 @@ export class CollectionUpdateService {
       timeout: 30000,
       allowedMimeTypes:
         update.resource_type === 'zim' ? ZIM_MIME_TYPES : PMTILES_MIME_TYPES,
-      forceNew: true,
       filetype: update.resource_type,
       title: update.resource_id,
       totalBytes: update.size_bytes,
diff --git a/admin/app/services/creator_pack_service.ts b/admin/app/services/creator_pack_service.ts
index fa5ec10..3629ef1 100644
--- a/admin/app/services/creator_pack_service.ts
+++ b/admin/app/services/creator_pack_service.ts
@@ -117,7 +117,6 @@ export class CreatorPackService {
       filepath,
       timeout: 30000,
       allowedMimeTypes: ZIM_MIME_TYPES,
-      forceNew: true,
       filetype: 'zim',
       title: pack.name,
       totalBytes: pack.size_mb ? pack.size_mb * 1024 * 1024 : undefined,
diff --git a/admin/app/services/zim_service.ts b/admin/app/services/zim_service.ts
index 9a5d97c..c8a735c 100644
--- a/admin/app/services/zim_service.ts
+++ b/admin/app/services/zim_service.ts
@@ -222,7 +222,6 @@ export class ZimService {
       filepath,
       timeout: 30000,
       allowedMimeTypes: ZIM_MIME_TYPES,
-      forceNew: true,
       filetype: 'zim',
       title: metadata?.title,
       totalBytes: metadata?.size_bytes,
@@ -331,7 +330,6 @@ export class ZimService {
         filepath,
         timeout: 30000,
         allowedMimeTypes: ZIM_MIME_TYPES,
-        forceNew: true,
         filetype: 'zim',
         title: (resource as any).title || undefined,
         totalBytes: resolved.sizeBytes,
@@ -830,7 +828,6 @@ export class ZimService {
       filepath,
       timeout: 30000,
       allowedMimeTypes: ZIM_MIME_TYPES,
-      forceNew: true,
       filetype: 'zim',
       title: selectedOption.name,
       totalBytes: selectedOption.size_mb ? selectedOption.size_mb * 1024 * 1024 : undefined,
diff --git a/admin/app/utils/downloads.ts b/admin/app/utils/downloads.ts
index cf60f73..9b269f9 100644
--- a/admin/app/utils/downloads.ts
+++ b/admin/app/utils/downloads.ts
@@ -8,6 +8,7 @@ import { deleteFileIfExists, ensureDirectoryExists, getFileStatsIfExists } from
 import { createWriteStream } from 'fs'
 import { rename } from 'fs/promises'
 import path from 'path'
+import logger from '@adonisjs/core/services/logger'
 
 // Some upstream mirrors reject requests with a missing or generic User-Agent.
 // Notably, download.kiwix.org routes the large Wikimedia-family ZIMs (Wikipedia,
@@ -121,6 +122,20 @@ export async function doResumableDownload({
     appendMode = false
   }
 
+  // A .tmp bigger than the file now on the server cannot be a prefix of it — the
+  // publisher replaced the file under the same name (openZIM rolls builds forward,
+  // see #1189/#1187). Resuming would ask for a range past the end and get a 416 on
+  // every attempt, with nothing deleting the .tmp, so the download could never
+  // recover on its own. Discard and start clean.
+  if (startByte > totalBytes && totalBytes > 0) {
+    logger.warn(
+      `[Download] Discarding stale partial for ${filepath}: .tmp is ${startByte}B but the server reports ${totalBytes}B`
+    )
+    await deleteFileIfExists(tempPath)
+    startByte = 0
+    appendMode = false
+  }
+
   // Add Range header if resuming
   if (supportsRangeRequests && startByte > 0) {
     headers.Range = `bytes=${startByte}-`