I am moving a client from v4.3/CRM 6.2 up to v2018/CRM 2018 R2. How many levels of CRM do I need to install in between? I believe I need to go to 7.0 SP1, but what would be the next jump? Once I am at 7.3, I know how to get to v2018; I am missing/forgetting the middle pieces since its been so long. What path would you take? Thanks!