Hello and welcome to the forum.
The Custom Shop program is just that - a shopping application where you can buy or select products to try out. It does not contain those products.
Space Delay
https://www.ikmultimedia.com/products/trspacedelay/ is a module within the T-Racks 5 ("TR5") product. To try it out you need to use the iKPM to download and install T-Racks 5. The installer installs a standalone TR5 program and the TR5 plug-ins. NB: All the other TR5 modules will be installed too.
From the Custom Shop Help:
Every item in the Custom Shop has its own independent trial period, 72 hours for AmpliTube gear and 14 days for T-RackS gear. Once the trial time has expired, the item will become locked and a trial expired icon will appear beside its card in the gear menu making it unusable.
NOTE: You must have the Custom Shop window open in order to try out the various gear models. If the Custom Shop window is not open, the gear model will emit a noise every few seconds. This is only the case for models that you are trying out. Once you have purchased a gear model, you do not need to have the Custom Shop window open.