Hello and welcome to the forum.
Did you get the orange-yellow "Are you sure" confirmation window? And click [YES] ?
I think you will need to click [Gear] and select "Restore my gear".
AmpliTube Custom Shop User Manual wrote: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.
That manual (along with the AmpliTube User Manual) was installed when you ran the AmpliTube Custom Shop installer.