Was there something else that was downloaded? The tar file I opened didn't have the ADB executable in (unless they were all called something.elf)
Only the following files:
AdbWinUsbApi.dll, AdbWinApi.dll, adb.exe
They get downloaded into the %temp% folder, then the script runs which, amongst other things, invokes adb commands:
--- adb starting (pid 3684) ---
adb I 01-06 17:15:26 3684 3832 main.cpp:63] Android Debug Bridge version 1.0.41
adb I 01-06 17:15:26 3684 3832 main.cpp:63] Version 33.0.1-8253317
adb I 01-06 17:15:26 3684 3832 main.cpp:63] Installed as C:\Users\someuser\AppData\Local\Temp\adb.exe
adb I 01-06 17:15:26 3684 3832 main.cpp:63]
adb I 01-06 17:15:26 3684 3832 auth.cpp:417] adb_auth_init...
adb I 01-06 17:15:26 3684 3832 auth.cpp:220] User key 'C:\Users\someuser\.android\adbkey' does not exist...
adb I 01-06 17:15:26 3684 3832 auth.cpp:64] generate_key(C:\Users\someuser\.android\adbkey)...
adb I 01-06 17:15:27 3684 3832 auth.cpp:152] loaded new key from 'C:\Users\someuser\.android\adbkey' with fingerprint <LONG FINGERPRINT HERE>
adb I 01-06 17:15:27 3684 5948 transport.cpp:304] RM330UNIQUESERIALNUMBER: write thread spawning
adb I 01-06 17:15:27 3684 1392 transport.cpp:332] RM330UNIQUESERIALNUMBER: read thread spawning
adb I 01-06 17:15:27 3684 3832 transport.cpp:1623] fetching keys for transport RM330UNIQUESERIALNUMBER
adb I 01-06 17:15:27 3684 3832 auth.cpp:469] Calling send_auth_response
adb I 01-06 17:15:27 3684 3832 auth.cpp:436] Calling send_auth_publickey
adb I 01-06 17:15:47 3684 1392 transport.cpp:336] RM330UNIQUESERIALNUMBER: read failed: Input/output error
adb I 01-06 17:15:47 3684 1392 transport.cpp:1225] RM330UNIQUESERIALNUMBER: connection terminated: read failed
adb I 01-06 17:15:47 3684 3832 adb.cpp:175] RM330UNIQUESERIALNUMBER: offline
adb I 01-06 17:15:47 3684 3832 transport.cpp:910] destroying transport RM330UNIQUESERIALNUMBER
adb I 01-06 17:15:47 3684 3832 transport.cpp:404] BlockingConnectionAdapter(RM330UNIQUESERIALNUMBER): stopping
adb I 01-06 17:15:48 3684 3832 transport.cpp:422] BlockingConnectionAdapter(RM330UNIQUESERIALNUMBER): stopped
adb I 01-06 17:15:48 3684 3832 transport.cpp:291] BlockingConnectionAdapter(RM330UNIQUESERIALNUMBER): destructing
adb I 01-06 17:15:48 3684 3832 transport.cpp:397] BlockingConnectionAdapter(RM330UNIQUESERIALNUMBER): already stopped
adb I 01-06 17:16:02 3684 5392 transport.cpp:332] RM330UNIQUESERIALNUMBER: read thread spawning
adb I 01-06 17:16:02 3684 1356 transport.cpp:304] RM330UNIQUESERIALNUMBER: write thread spawning
adb I 01-06 17:16:02 3684 3832 adb.cpp:171] RM330UNIQUESERIALNUMBER: already offline
adb I 01-06 17:16:19 3684 5392 transport.cpp:336] RM330UNIQUESERIALNUMBER: read failed: Input/output error
adb I 01-06 17:16:19 3684 5392 transport.cpp:1225] RM330UNIQUESERIALNUMBER: connection terminated: read failed
adb I 01-06 17:16:19 3684 3832 adb.cpp:175] RM330UNIQUESERIALNUMBER: offline
adb I 01-06 17:16:19 3684 3832 transport.cpp:910] destroying transport RM330UNIQUESERIALNUMBER
adb I 01-06 17:16:19 3684 3832 transport.cpp:404] BlockingConnectionAdapter(RM330UNIQUESERIALNUMBER): stopping
adb I 01-06 17:16:19 3684 3832 transport.cpp:422] BlockingConnectionAdapter(RM330UNIQUESERIALNUMBER): stopped
adb I 01-06 17:16:19 3684 3832 transport.cpp:291] BlockingConnectionAdapter(RM330UNIQUESERIALNUMBER): destructing
adb I 01-06 17:16:19 3684 3832 transport.cpp:397] BlockingConnectionAdapter(RM330UNIQUESERIALNUMBER): already stopped
adb I 01-06 17:16:29 3684 6068 transport.cpp:304] RM330UNIQUESERIALNUMBER: write thread spawning
adb I 01-06 17:16:29 3684 316 transport.cpp:332] RM330UNIQUESERIALNUMBER: read thread spawning
adb I 01-06 17:16:29 3684 3832 adb.cpp:171] RM330UNIQUESERIALNUMBER: already offline
adb I 01-06 17:17:53 3684 316 transport.cpp:336] RM330UNIQUESERIALNUMBER: read failed: Input/output error
adb I 01-06 17:17:53 3684 316 transport.cpp:1225] RM330UNIQUESERIALNUMBER: connection terminated: read failed
adb I 01-06 17:17:53 3684 3832 adb.cpp:175] RM330UNIQUESERIALNUMBER: offline
adb E 01-06 17:17:53 3684 6068 transport_usb.cpp:166] remote usb: 1 - write terminated: Input/output error
adb I 01-06 17:17:53 3684 3832 transport.cpp:910] destroying transport RM330UNIQUESERIALNUMBER
adb I 01-06 17:17:53 3684 3832 transport.cpp:404] BlockingConnectionAdapter(RM330UNIQUESERIALNUMBER): stopping
adb I 01-06 17:17:53 3684 3832 transport.cpp:422] BlockingConnectionAdapter(RM330UNIQUESERIALNUMBER): stopped
adb I 01-06 17:17:53 3684 3832 transport.cpp:291] BlockingConnectionAdapter(RM330UNIQUESERIALNUMBER): destructing
adb I 01-06 17:17:53 3684 3832 transport.cpp:397] BlockingConnectionAdapter(RM330UNIQUESERIALNUMBER): already stopped