Just noticed that the ISI forums have dropped all rF2 links to dev corner. If you click try/buy rFactor 2 on the ISI website you use to get a page about rf2 and tabs about download content and dev corner etc. They all point to studio-397. Where is the new links for this please.
In the meanwhile, if you need something, old DevCorner is still available; http://rfactor.net/web/rf2/devscorner/
Any of the legacy stuff you are looking for, look in the footer of the site. Hopefully today any old links will 301 redirect to the new location anyway, as the new location should exist.