Thanks to RaceDepartment for listing and supplying downloads. (http://www.racedepartment.com/)
Adelaide 1988 Street download (https://www.mediafire.com/folder/y3gywz4wp7c52/Public_files) or download Flattop's S3 Bucket (https://s3-ap-southeast-2.amazonaws.com/flattops.bucket/AssettoCorsaTracks/Adelaide+1988+v1.2+by+SBB.7z)
Aosta download (https://mega.co.nz/#!ZUcjCaRa!Qc3jMkkbHBnYKLpVpo8qL8VKCVB3gw5xf0yap6aYuVo)
Barbagallo download (http://simhqmotorsports.com/downloads/motorsports/assettocorsa/tracks/barbagallo-release-v1.2.rar) or Barbagallo 1.2 S3 download (https://s3-ap-southeast-2.amazonaws.com/flattops.bucket/AssettoCorsaTracks/barbagallo-release-v1.2.rar)
Baskerville Raceway download (http://www.racedepartment.com/downloads/baskerville-raceway.3436/)
Blackwood Reloaded 0.8 S3 Bucket (https://s3-ap-southeast-2.amazonaws.com/flattops.bucket/AssettoCorsaTracks/blackwood_reloaded_hd_0.8.rar) <--- Updated 16-01-2016
Brands Hatch download (http://www.racedepartment.com/downloads/brands-hatch.2726/updates)
Bridgehampton .7 Race Dept download (http://www.racedepartment.com/downloads/bridgehampton-race-circuit.6604/) Flattop's S3 Bucket download (https://s3-ap-southeast-2.amazonaws.com/flattops.bucket/AssettoCorsaTracks/bridgehampton_0.0.7.zip). <--- Updated to 1.11 Aug 7th 2015
Donington Park 1.13 download / (http://www.racedepartment.com/downloads/donington-park.3031/download?version=14877) Alternative S3 (http://pubimg.s3.amazonaws.com/doningtonpark_1.13.rar)
Eastern Creek Raceway 2014 download (https://www.mediafire.com/folder/y3gywz4wp7c52/Public_files)LINK FIXED
GenTrack1 download (http://www.mediafire.com/download/vam6p8misqwjbjz/GenTrackV095.zip)
Greenvalley Track Resort 1.0 download (http://www.mediafire.com/download/qvc2991y5fz2b9l/Greenvalley+1.0.rar)
Grobnik download (http://www.racedepartment.com/downloads/automotodrom-grobnik.4835/)
Hockenheim (Tommy78 version) download (http://www.racedepartment.com/downloads/hockenheimring-multi-layout.7223/)
Hockenheim 1988 download (https://www.mediafire.com/folder/y3gywz4wp7c52/Public_files)
Hungaroring download (http://www.racedepartment.com/downloads/hungaroring.2577/) S3 Bucket Download (https://s3-ap-southeast-2.amazonaws.com/flattops.bucket/AssettoCorsaTracks/hungaroring_0.9.5.rar)
Interlagos download (http://www.racedepartment.com/downloads/interlagos.2445/)
Jerez 1988 download (https://www.mediafire.com/folder/y3gywz4wp7c52/Public_files)
Luccaring V0.7a Flattop's S3 Bucket download (https://s3-ap-southeast-2.amazonaws.com/flattops.bucket/AssettoCorsaTracks/luccaring.rar)
Lippo Street Circuit download page (http://www.racedepartment.com/downloads/lippo-village-street-circuit-indonesia.3536/updates/) / Alternative d/l FlatTop's dropbox (https://www.dropbox.com/s/zogmqj8ybutk2ir/lippo_circuit_1_1.rar?dl=0)
Longford download at Race Department (http://www.racedepartment.com/downloads/longford-1967.2741/).
Mills Metropark download at Race Department (http://www.assettocorsa.net/forum/index.php?threads/mills-metropark-1-0-not-a-conversion-9-2-2015.23491/) Fast S3 download (https://s3-ap-southeast-2.amazonaws.com/flattops.bucket/AssettoCorsaTracks/Mills_Metropark_1_0_by_Rigel.rar).
Prato download (http://www.assettocorsa.net/forum/index.php?threads/prato-netkar-pro-conversion-v1-21.11336/)
Paul Ricard (2 Layouts) Update download (http://www.racedepartment.com/downloads/paul-ricard-v0-9-1.6115/) <--- Updated from Bucchulum's post
Pukekohoe Park Raceway 2013 download (http://www.racedepartment.com/downloads/pukekohe-park-2013.5067/)
Road America V3 download (http://www.racedepartment.com/downloads/road-america-3-0.7095/history)
Sachsenring download (http://www.racedepartment.com/downloads/sachsenring.4762/) OR Flattop's S3 Bucket download (https://s3-ap-southeast-2.amazonaws.com/flattops.bucket/AssettoCorsaTracks/sachsenring-1.1.rar)
Salzburgring download (http://www.racedepartment.com/downloads/salzburgring.2798/)
Singapore Street Circuit Night download (http://www.racedepartment.com/downloads/track-singapore-street-circuit-night.6761/)
Sochi download (http://www.racedepartment.com/downloads/track-sochi-acf1s-0-95.7006/)
Suzuka 1988 download (https://www.mediafire.com/folder/y3gywz4wp7c52/Public_files)
Red Bull Ring Spielberg download (http://www.racedepartment.com/downloads/spielberg.6437/) OR Flattop's S3 bucket download (https://s3-ap-southeast-2.amazonaws.com/flattops.bucket/AssettoCorsaTracks/spielberg_ver0.7.rar)
Yamanashi Sportsland download page (http://www.assettocorsa.net/forum/index.php?threads/sports-land-yamanashi-sly-drift-time-attack-1-02-update-06-01-15.11718/)