Hello,
The solution will be to have the assistant run as administrator mode.
If you run a service user which has not the right to install e.g. the packages it will fail.
So you can use the service user but before you have to set the assistance.exe to run as administrator and it will work just fine with a service user how has minimum permissions.
ppr
Anil_G
Yoichi
ashokkarale
Stef_99
Jon_Smith
KevinE
Sira
asiya_sultana
ABHIMANYU_THITE1