Now that Celestain's Ad&d project has gone official and is now included for free in like 3.5/4d and 5e and the first set of OSRIC modules found here https://www.fantasygrounds.com/forum...D-Core-Ruleset appear to work fine with it i have done the remaining classes ( Assassin, Druid, Paladin, illusionist and Ranger) . the module has been made with with Celestain"s First edition extension which can be found here https://www.fantasygrounds.com/forum...e-1e-Extention
Be warned OSRIC is an early clone of first edition released under the 3.5 OGL and has some subtle changes from TSR's first edition and some not so subtle but these can be edited if this bothers you. At the time OSRIC came out the authors did have some concerns about being sued by WOTC, more recent clones like this one for Basic/Expert promise 100% compatibility https://necroticgnome.com/collection...ool-essentials