Looks like your server have "Basic Management" license for iDRAC. With basic license, you need to gave iDRAC Express or Enterprise license. You can check below link to see iDRAC features enabled with different licenses

https://www.dell.com/support/article/en-us/sln316859/idrac7-idrac8-idrac-unresponsive-or-sluggish-performance?lang=en&ref=topsolutions

The iso file you trying to upload to iDRAC is not license. That is a utility which helps to mange license on iDRAC. If you want to try all features of iDRAC you can download  30 days trail license(iDRAC 7 Enterprise Trial) from below link.

https://www.dell.com/support/article/us/en/04/sln309292/download-idrac-trial-license-to-enable-poweredge-enterprise-features?lang=en#1 

OK thanks.
Where do I find the costs of the iDRAC7 and iDRAC8 licenses?
How can I check if my server can activate iDRAC8?
Finally, in your opinion, should I activate iDRAC with only one server in the company?

I have already installed iDrac with the Enterprise license in evaluation.
I found only the cost of iDRAC 8 Enterprise on the Internet and it costs over $ 450.
For us it is excessive having only one server.
I can not find the prices of other licenses, especially iDRAC 7:
Can I install iDRAC8?