Thanks to Jon Sandman, who generously donated to cover the cost of hosting the website for 1 year, the website is still alive !
How to sync your inventory
1. Run Rocket League (English only)
2. Run BakkesMod (with default rcon password)
5. Click on Sync your inventory.
Thanks to Jon Sandman for covering the hosting costs, RL.Insider.gg for letting me use their price database, BakkesMod for giving me access to his mod, Martinn for the new decryptor and glhglh for helping me optimize updates.