Don't understand WUD's GUI

[conceptualclarity]

I am grateful for Windows Updates Downloader, which seems like a great program. I do have a question. As you see in the screenshot I have used WUD to do a lengthy download of XP Service Pack 3 because I seem to have some files missing from that. i don't know what to do next because I don't know what the three square buttons at the top are. I don't see any wording when I hover my arrow by them.

 

 

Computer:      DELL Dimension 2400
CPU:           Intel Pentium 4-2667 (Northwood, D1)
               2666 MHz (20.00x133.3) @ 2658 MHz (20.00x132.9)
Motherboard:   DELL 0G1548
Chipset:       Intel 845GEV (Brookdale-GEV) + ICH4
Memory:        2048 MBytes @ 166 MHz, 2.5-3-3-7
               - 1024 MB PC3200 DDR-SDRAM - Kingston K
               - 1024 MB PC3200 DDR-SDRAM - Kingston K
Graphics:      Intel 82845G/GL/GV Graphics Controller [DELL]
               Intel i845G(L) Integrated, 64 MB 
Drive:         WL120GPA872, 117.2 GB, E-IDE (ATA-7)
Drive:         WDC WD2500JB-57GVC0, 244.2 GB, E-IDE (ATA-6)
Drive:         HGST HTS545050A7E380, 488.4 GB, Serial ATA 3Gb/s <-> USB
Drive:         SAMSUNG CD-R/RW SW-252S, CD-R Writer
Sound:         Intel 82801DB(M) ICH4(-M) - AC'97 Audio Controller [A-1]
Sound:         Creative Technology SB Live! Series Audio Processor
Network:       RealTek Semiconductor RTL8139 PCI Fast Ethernet NIC [A/B/C]
OS:            Microsoft Windows XP Home Edition Build 2600
Antivirus:           Panda Antivirus Pro 17.0.1
Firewall:            Panda Antivirus Pro 17.0.1
Ad Blocker:          Adguard, Ad Muncher, Adblock Plus
Default Browser:     Maxthon 4.4.8.1000