For anyone that might find this useful.
For learning purposes, testing, upgrades etc, in windows I use the following method to spin up different instances of grafana
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I download the zip file
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Extract the zip file
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Move the extracted folder to my C:\Program Files
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Modify the default.ini in the config folder
I match the port to the version of the install
http_port = 3902
This one is for version 9.0.2 -
using nssm (https://nssm.cc/) I run the following command
nssm install _grafana.9.0.2
Adding the _ underscore helps it bubble up to in Services
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Then start that service