How do you upgrade Workflow 8 to Workflow 10.2 without disrupting active/running/waiting workflow instances? 

The help files state that I must perform a complete install of Workflow 10.2 before running the migration utility. 

However, as I run the upgrade, it states that I must stop the Workflow 8.0 service and Workflow 8 Subscriber service before I can continue with the upgrade. 

My question is if this will stop the running instances. If so, how do I get around this? I can hit ignore, but want to make sure their would be no issues.