The community is very eager to update the original tracks, like in 2005 for original tracks and 2006 for world tour (this project was never finished entirely), and here's the 'official' thread for it. The rules aren't that strict, but they're important to keep the project well-organized. Btw don't worry about rule 1.8 and 1.8b, the requirements to pass these rules won't be that high Here are the rules:
Rules
1.1 Each track can be booked by up to 3 different trackmakers.
1.1b If a track has 1 finished version, then it can be booked by 2 trackmakers, if 2 versions, then by 1. If 3 versions are finished, no one can't book it.
1.1c If you can't book a track, you're allowed to finish and release it (obeying rule 1.4), but it will not be in the official pack.
1.2 A trackmaker can have up to 2 different tracks booked at a time.
1.3 A trackmaker can finish as many tracks as he wants, but only one version of a track.
1.4 Once the track is finished it has to be posted in the Original Track Update -thread.
1.5 The project won't be declared as finished until there's at least one version of every track.
1.6 After every track has at least 1 finished version, there will be a voting for those tracks which have more than 1 version. The version with most votes will be added to the official pack.
1.7 Author's comments in track properties must include name of project, original author (Hannu/Jukka) and the name of updater.
1.8 If someone has booked and released a track, that has very low quality and does not improve the original track, can be declined by the choice of organizer (AleksiNir).
1.8b If the track won't be extremely low-quality, but remarkably lower quality than other versions of the track candinating on the election, it can be declined by the choice of organizer.
1.9 The track has to be posted before 2 months have passed since the booking, after that it can be booked by others. Of course exceptions can be made, if the track is almost finished. This occurs only, when the track has 3 bookings.
2. Track updating rules
2.1 Tracks must remain recognizable as the original track.
2.2 No big changes in layout.
2.2b No change in pit position.
2.3 No big changes in theme, eg. [stc] must stay as [stc] track.
2.4 No big changes in surroundings, eg. track on desert can't be in jungle.
2.5 "Evolution", as in [evo] tag, is allowed, as long as it doesn't break rule 2.1
2.6 World size can be changed up or down from original by up to 20.
2.7 Small changes in hmap are allowed.
2.8 No changes in rotation allowed, but up to 5° change in view angle and 10° in zoom is allowed.
2.9 You can take layout and hmap directly from original track, but it is recommended to do most of the scenery from scratch.
3. Voting rules
3.1 Anyone registered to GRRF can vote.
3.2 Voter can vote for 1 version of every track, that has more than 1 finished versions.
3.3 Voting election will be elected after all tracks have at least 1 version.
The project is now over, election chose the best tracks of the project per each updated track. You can see the details of the voting in this post, here are direct links to two zip files containing the elected tracks:
part 1 - part 2
All particular submitted tracks
If you want to taste more than only the few elected tracks, here are available links to all tracks, which the election was choosing from plus several other submitted versions, which weren't approved for the poll according rules 1.8 and 1.8b or because were submitted too late for election (marked by sign "*").
Original tracks
Agari
1. Trigger Happy & ZGR - link
2. Otto Wilson - link
3. XYY - link
Bytes
1. Mad Dan - link
2. CamrosX - link
Gilwan
1. Trigger Happy - link
Gurveln
1. Bouncebackability - link
*. andrew2209 - link
Kutford
1. Bouncebackability - link
2. _Uruka_ - link
*. The MNZ - link
*. Qwerz - link
Mondega
1. Tilt+ - link
2. vax - link
3. Areen - link
*. Otto Wilson - link
Nyrporl
1. Otto Wilson - link (bonus versions - link)
Pargy
1. XYY - link
Sewring
1. Bouncebackability - link
Snoogy
1. Bouncebackability - link
2. Brix - link
Tachren
1. Martyn - link
2. Mad Dan - link
Tantele
1. Martyn - link
2. Trigger Happy - link
3. _Uruka_ - link
Tusaye
1. XYY - link
Wendan
1. JWong - link
Wigeno
1. Mad Dan & XYY - link
2. happy412 - link
Xupong
1. Mad Dan - link
2. JWong - link
World tour
Algeria
1. Martyn - link
2. Bouncebackability - link
3. Areen - link
Australia
1. preetzertrain - link
2. Bouncebackability - link
Belgium
1. GeneSuomi - link
2. _Uruka_ - link
Brazil
1. GRF - link
2. CamrosX - link
*. The MNZ - link
Canada
1. Tilt+ - link
2. CamrosX - link
Egypt
1. Martyn - link
Finland
1. Tilt+ - link
2. JWong & Trigger Happy - link
France
1. XYY - link
*. The MNZ - link
Germany
1. XYY link
Indonesia
1. preetzertrain - link
2. eMeR - link
Italy
1. Brix - link
2. Bouncebackability - link
Japan
1. Bouncebackability - link
2. Brix - link
3. XYY - link
Switzerland
1. XYY link
2. _Uruka_ - link
Sweden
1. Otto Wilson - link
USA
1. XYY - link