FYI, I found ALL the manuals there in PDF (300MB+). Just a bit difficult to find.
Go to the "Individual Vehicle Information" -> "Repair information" and "Training Items" menus and you can download lots and lots of stuff.
Here is what I found so far:
12/04/2020 07:42 AM 27,033,782 A8_Octavia_OwnersManual.pdf
01/20/2021 10:41 AM 8,307,616 D4B805208DB-Propshaft_and_rear_final_drive.pdf
01/20/2021 10:41 AM 6,308,565 D4B8064A3AF-Paint_-_general_information.pdf
01/20/2021 10:38 AM 2,166,356 D4B80655686-Air_conditioning_system_with_refrigerant_R1234yf.pdf
01/20/2021 10:41 AM 659,007 D4B80828146-Trailer_operation_as_of_2016.pdf
01/20/2021 10:40 AM 13,526,413 D4B8090B918-Fuel_system_-_Petrol_engines.pdf
01/20/2021 10:45 AM 13,638,469 D4B809CDE79-Maintenance.pdf
01/20/2021 10:39 AM 26,445,044 D4B809D336C-Body_Repairs.pdf
01/20/2021 10:40 AM 27,891,911 D4B80A03A21-Chassis__axles__steering.pdf
01/20/2021 10:38 AM 12,976,337 D4B80A03DD0-6-speed_dual_clutch_gearbox_0DD_(Hybrid).pdf
01/20/2021 10:39 AM 2,789,440 D4B80A03FD8-Auxiliary_heating.pdf
01/20/2021 10:39 AM 10,851,238 D4B80A03FE8-Brake_systems.pdf
01/20/2021 10:41 AM 2,220,073 D4B80A0402C-Wheels__Tyres.pdf
01/20/2021 10:41 AM 17,663,828 D4B80A04119-Paint_-_vehicle-specific_information.pdf
01/20/2021 10:39 AM 5,498,491 D4B80A04129-Communication.pdf
01/20/2021 10:41 AM 26,318,202 D4B80A04200-General_body_repairs__interior.pdf
01/20/2021 10:38 AM 12,759,446 D4B80A0424F-Heating__Air_conditioning.pdf
01/20/2021 10:40 AM 24,347,989 D4B80A042DD-Electrical_system.pdf
01/20/2021 10:41 AM 27,061,315 D4B80A043BE-General_body_repairs__exterior.pdf
01/20/2021 10:36 AM 47,398,736 D4B80A956A1-1_0_70__81_kW_TSI_EVO_Engine.pdf
01/20/2021 10:44 AM 4,341,752 S0020026120-Satellite_navigation_systems_in_Skoda_vehicles.pdf
01/20/2021 10:43 AM 1,522,202 S0020027720-Nr__77__Geometry.pdf
01/20/2021 10:43 AM 1,621,540 S0020027820-Nr__78__Pasive_safety.pdf
01/20/2021 10:43 AM 833,745 S0020027920-Nr__79__Auxiliary_heater.pdf
01/20/2021 10:43 AM 1,346,468 S0020028120-Nr__81__Bluetooth_in_SKODA_cars.pdf
01/20/2021 10:43 AM 1,472,380 S0020028220-Nr__82__Sensors_in_Skoda_vehicles_-_Engine.pdf
01/20/2021 10:43 AM 1,169,015 S0020028520-Nr__85__System_KESSY_in_SKODA_cars.pdf
01/20/2021 10:43 AM 3,106,670 S0020028620-Nr__86__System_START-STOP_in_SKODA_cars.pdf
01/20/2021 10:43 AM 1,737,121 S0020028720-Nr__87__Immobiliser_in_Skoda_vehicles.pdf
01/20/2021 10:43 AM 4,988,471 S0020028820-Nr__88__Brake_and_stabilisation_systems.pdf
01/20/2021 10:43 AM 2,545,793 S0020028920-Nr__89__Sensors_and_senders_in_Skoda_vehicles_-_Safety_and_Convenience.pdf
01/20/2021 10:44 AM 2,473,199 S0020035320-SkodaOctavia__Presentation_of_the_vehicle.pdf
01/20/2021 10:44 AM 2,250,552 S0020035420-SkodaOctavia__Electrical_Components.pdf
01/20/2021 10:44 AM 2,364,256 S0020035820-SkodaOctavia__Chassis_and_electromechanical_power-assisted_steering.pdf
01/20/2021 10:44 AM 4,933,771 S0020037420-SKODA_OCTAVIA.pdf
01/20/2021 10:44 AM 1,125,237 S0020037620-OCTAVIA_Convenience_electronic_system.pdf
01/20/2021 10:44 AM 904,339 S0020038320-OCTAVIA__CAN_databus.pdf
01/20/2021 10:44 AM 1,918,809 S0020038420-OCTAVIA_-_CLIMATRONIC.pdf
01/20/2021 10:44 AM 2,939,799 S0020038720-OCTAVIA_-_ESP.pdf
01/20/2021 10:44 AM 1,284,623 S0020039020-OCTAVIA_-_Radio_navigation.pdf
01/20/2021 10:42 AM 2,481,123 S0020039820-Euro-On-Board-Diagnosis.pdf
01/20/2021 10:42 AM 3,508,735 S0020040020-6-Speed_manual_gearbox_02M.pdf
01/20/2021 10:42 AM 1,964,004 S0020040220-Exhaust_emission.pdf
01/20/2021 10:42 AM 1,968,630 S0020040320-Extended_maintenance_interval.pdf
01/20/2021 10:39 AM 1,498,578 S0051870020-Body_Repairs__General_Body_Repairs.pdf
01/20/2021 10:40 AM 2,923,534 S0051880020-Electrical_System_-_general_notes.pdf
01/20/2021 10:46 AM 81,030,927 S0067420020-Basic_equipment__(K8B)__From_November_2019.pdf