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Garry's Mod Workshop Download Troubleshooting: Missing Addons and Content

Garry's Mod Guide • Updated Sep 1, 2026

Garry's Mod Workshop Download Troubleshooting

When a player sees “ERROR” models, missing materials, or a join that stops during download, first identify which layer failed. The server collection, client Workshop cache, and custom content delivery are separate. A reinstall rarely fixes a collection that is private or a server that never tells the client about its content.

Last verified: September 1, 2026. Facepunch's Workshop guide covers collection startup; its content-serving guide distinguishes WorkshopDL, FastDL, legacy ServerDL, and Lua delivery.

Symptom-to-layer map

SymptomLikely layerFirst check
Server starts without the collectionServer Workshop fetchCollection is public/unlisted and the ID is passed with +host_workshop_collection.
Client stuck at downloadingClient delivery/cacheTest one clean client and inspect the server console for the requested content.
“ERROR” models or purple texturesMissing mounted/custom contentCheck the addon documentation and whether resource.AddWorkshop or FastDL is required.
Join works with flags disabledAddon or Workshop conflictRe-enable the collection one item at a time and keep the last known-good ID.

1. Check the collection

  1. Open the collection in Steam Workshop and confirm it is public or unlisted.
  2. Copy the numeric collection ID from the URL, not an individual addon ID.
  3. Start the server with:
./srcds_run -game garrysmod -console \
  +host_workshop_collection COLLECTION_ID \
  +gamemode sandbox +map gm_construct

Read the startup console for fetch, dependency, or permission errors. The server installs/updates the collection at startup; it does not make a private collection public for you.

2. Separate server files from client delivery

Facepunch documents WorkshopDL as the preferred fast path for Workshop content. For a custom addon that requires Lua, follow its current instructions and use resource.AddWorkshop in a server-side autorun file. FastDL requires a correctly configured HTTP server. Legacy ServerDL is slow and should generally be avoided.

Do not add sv_allowdownload, net_maxfilesize, or arbitrary paths as a universal fix. Those settings do not replace a missing Workshop collection or a bad content manifest.

3. Isolate one variable

  1. Start with a stock map and -noaddons -noworkshop.
  2. Confirm a clean client can connect.
  3. Enable the Workshop collection, restart, and test again.
  4. Remove or update only the addon that changes the result; keep the last known-good collection manifest.

4. Client-side checks

  • Let the Workshop download finish before joining again; do not launch multiple stale server sessions.
  • Verify the client is subscribed to the collection when the addon author requires client subscription.
  • Test a second client profile or a clean machine to distinguish a local cache issue from server delivery.
  • Record the missing Workshop ID, map, gamemode, and the exact console error.

A recent community report describes specific addons refusing to download after previously working. Treat it as a useful symptom pattern, then use the official delivery paths above to identify whether the server or client is failing.

Related Garry's Mod guides

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