This may be too late but perhaps could help any one with the same issue. I experienced this while installing a Lev2 and the error occurred due to SAS Deployment Agent had same named service as Lev1 install. The trick is if the binary install SDW page is still up (not terminated). what I did was to navigate to
<some dir>\SASHome\SASDeploymentAgent\9.4\service-wrapper\wrapper.conf' and edited the entries
# Name of the service wrapper.ntservice.name=SAS Deployment Agent_2
# Display name of the service
wrapper.ntservice.displayname=SAS Deployment Agent_2
# Description of the service
wrapper.ntservice.description=SAS Deployment Agent_2
(Edited to add _2) > saved wrapper.conf > in SDW clicked on Retry and the install continued.
HTH
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