Where can I find a trial version of a legacy app: McAfee ePolicy Orchestrator 4.6.6? Looking for a download.

They offer old versions for customers that were customers when they were released.

There is this question here on EE that explains a lot
To Update McAfee Agent from 4.5 to 4.8  with ePO 4.6.6
https://www.experts-exchange.com/questions/28464859/To-Update-McAfee-Agent-from-4-5-to-4-8-with-ePO-4-6-6.html
You need either an account to log in or the grant number or the  serial number
https://support.mcafee.com/ServicePortal/faces/downloads?_afrLoop=3059984231924000&_afrWindowMode=0&_afrWindowId=null#%40%3F_afrWindowId%3Dnull%26_afrLoop%3D3059984231924000%26_afrWindowMode%3D0%26_adf.ctrl-state%3Du6jn33zbs_4

Are you sure you want 4.6.6? - It is deprecated because it's full of security holes which were fixed in 4.6.7 - this is still available from their free trial downloads - there are a load of reasons why you wouldn't want to put ePO 4.6.6 into a production environment.

can check out this though it stated zip for below

3.Back up the ePO folder (c:\Program Files (x86)\ePolicy Orchestrator).
4.Download and extract the appropriate ZIP file attached to this article to the ePO server.

•468_Files.zip for customers who upgraded to 4.6.8
•467_Files.zip for customers who upgraded to 4.6.7
•466_Files.zip for customers who upgraded to 4.6.6

https://kc.mcafee.com/corporate/index?page=content&id=KB78566

OK, I installed v 4.6.7 instead. I need to test EEPC on a laptop. I am looking for (MfeEEAgent.zip and MfeEEPC.zip). I am using the trial version of ePO 4.6.7. Can I try out EEPC 7.0.3. 413 using the trial version of ePO 4.6.7? Do I download the extension and packages, then upload it to the master repository? Then, do I check in the packages and extensions through Software manager?

Yes, you can download trial versions of all mcafee products and pump them through trial ePO

Also do note the ePolicy Orchestrator 4.6.7 Known Issues
https://kc.mcafee.com/corporate/index?page=content&id=KB79208