Good advice above. When I first upgraded to 2018 I didn't buy the 'full' package but soon realised I would really benefit from the wider choice of RealTracks. PG allowed me to upgrade by simply paying the difference which was great.

My only whinge is that although I buy everything I never use jazz styles or things like Klezmer - just rock, pop, bluegrass, country and folk but you can't really pick and choose upgrades by genre.