The Hub won't install content packs, it's only for software.
You need to use the Content Manager to install and use content.
Open the Content tab and make sure that Template, Pack and All are selected. Click the "Filter" box to expand it.

Once expanded select "Not Installed" from the list.

Click the Refresh button.

A green progress bar will show in the bottom of the window while the content is being synced with your account at Reallusion.

Depending on the number of items not installed this can take some time to complete. Once finished the content panel will show thumbnails of any and all packs not installed on your system. These thumbnails will be Black & White with a small green cloud icon. Double click on each one and wait until the thumbnail changes from B&W to a colour one indicating that the items are now installed.
Once everything is installed it's best to exit CC and restart it again.
Gerry
System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.