Remove one version of Windows 10

On my computer I have two versions of Windows 10 OS. One is the free version from Microsoft. The other is the evaluation version that I have been upgrading for over a year. I want to remove the evaluation version. My hard drive has 5 partitions and the evaluation version is on one of the partitions but I don't know which one. How do I make sure I remove the correct version?

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Clarification Request
Tiny Windows Icon

I notice that when I go to the file explorer, one of my HDD partitions has a tiny windows icon to the left of the partition identifier. Could that tiny windows icon be telling me that it is the partition that contains the OS that I am currently using? If that is the case (and if I am sure of it) I can simply erase the partition that has the other Windows 10 OS. Is that a reasonable assumption? Does the partition on your machine that has the W10 OS have the tiny windows icon beside it?

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This is where you make a full backup

I'd clone the drive and test your deletes and such on the clone before you do anything on the last copy of this drive.

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Maybe a BCDEDIT can reveal more detail?
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Go to system.

check the "product ID", are they the same, if not then the ID should tie to the original. But if they are the same, then the "activation key" would tell you which is which. I use Belarc Advisor to get the key info. But if you have the key on the case...then you don't need Belarc.

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Checking the ID is not a solution

Checking the product ID is not a solution. I know which OS I want to remove. I just don't know where it is located on my hard drive. I have 5 partitions on the HDD and two of them have Windows installed on them. I don't know which is the one I want to keep and which is the one I want to remove.

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You have both win10 on the same Hdd but...

different partitions. I didn't know that can be done. Learn something everyday.

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Ok I think I got it.

What partition software do you use? Take note of the two window partitions, their size and usage. Now boot up the one you want to remove and uninstall applications and removing data files. Now recheck your window partitions. On one of them the usage should have been decreased..and that's the one you want to remove. That sound ok to you?

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