Access the path 'C:ProgramDataSourceCodeTemp{randomcharacters}.kspx{guid}' is denied. Service: PackageDeploymentService

The same issue may happen if you installing K2 blackpearl 4.7 and your K2 service account has not been added into Local Administrator group - then number of KSPX packages which supposed to be deployed in the process fail to deploy without indication WHY:

You can verify if you run into this if you go to "C:Program Files (x86)K2 blackpearlSetup" and double click one of these packages and try to deploy it, e.g. click on Management.kspx - even on preparing package stage before analysis it will throw errors indicating insufficient access rights on a file system level.

It seems there are no strict requirement for K2 service account to be in Local Administrators but rather a set of requirement permissions stipulated - but this list misses this specific permission - Modify on "C:ProgramDataSourceCodeTemp", though in my test environments I get used to adding K2 service account in Local Administrators group to save time on configuring more granular permissions.
What I noticed when running into this is that if you just add your K2 service account into local administrator group and re-run PnD you may still see these errors - until you remove all contents of this temp folder (may require stopping of K2 service). But even after this simple re-run of K2 Configuration Analysis + Repair button does not help to resolve errors in setup manager.

What you need to do next is to run K2 blackpearl setup manager from installation media and perform Repair - then KSPX packages deploying just fine.

Little extra note: there is no Local Admin membership requirement for K2 service account in K2 documentation (I so used doing this in my test environments that I was almost started to think it is a requirement :) until revisited requirements ). So you just need grant permissions for K2 service account to specific folder (this supposed to be in K2 documentation, though it is not there yet).