In RepTime, navigate to Maintenance > Manufacturers, and select your manufacturer.
On the Name/Address tab (the default tab the MFG Maintenance window opens to) click the Download Products button:
Once you click Download Products, you'll be shown the following window:
To Update the catalog, choose the Update button, and click Start Transfer to begin updating the catalog you have in RepTime, with what your vendor has updated as of 2AM CST that morning.
To Replace the catalog entirely, choose the Replace button, and click Start Transfer to replace the current catalog in RepTime with what your vendor has updated as of 2AM CST that morning.
NOTE: Choosing REPLACE will also remove any custom items you may have in this catalog, so choose wisely!
Once it's complete, you will be shown the results of your actions, as seen in the example below:
Depending on the manufacturer, I would suggest updating the catalog at least once a week, to ensure you and your reps have the most up-to-date catalog!