Electronic – Altium Gerber Top Paste is missing components

If I understand your question, that you want to edit the silk screen gerber without changing the original pcb file, yes, it's possible.

You use Altium's included CAM editor (CAMtastic). Stack Exchange won't let me link the manual section because it's a numeric URL, but you can find it easily.

Of course next time you generate the output job (because of a revision, say), you'll have to repeat the editing, so it's usually not the best way to do things.

I have downloaded the design you are dealing with. The gerber files, all layer files have .PHO extension.

Import gerbers into Altium

If you rename the files as follows you will be able to open them in Altium:

• Layer4.pho \$ \longrightarrow \$ Layer4.GBL, this is the bottom layer
• Layer1.pho \$ \longrightarrow \$ Layer1.GTL, this is the top layer
• Layer2.pho \$ \longrightarrow \$ Layer2.GP1, GND plane 1
• Layer3.pho \$ \longrightarrow \$ Layer3.GP2, GND plane 2
• SoldermaskBottom.pho \$ \longrightarrow \$ SoldermaskBottom.GBS
• SoldermaskTop.pho \$ \longrightarrow \$ SoldermaskTop.GTS

I have identified the layers by the PDF appendix. For Pastemask (GBP, GBT) and Silkscreen layers you should search for their Altium extensions.

These modified files can be dragged and dropped into Altium, example for Top layer:

This way all layer files are easily openable in Altium.

Export TopLayer gerber into PCB document file

1. Select Layer1.GTL tab in Altium

2. Select the Menu → Tables → Layers Order option. Following dialog will be shown: Fill the cells as below.

   

3. Enable the Export to PCB option as follows: Menu → Tools → Netlist → Extract.

   "After a netlist has been extracted from your CAM data, the File » Export » Export to PCB command becomes enabled" source

4. Now, select Menu → File → Export → Export to PCB and a new PCB document will be opened with the Top Layer.

   Result: