Cannot add host to vCenter server

Cannot add host to vCenter server. My current web version is 5.5.0 Build 2175560

Basically its the same issue as this: https://www.experts-exchange.com/questions/28933457/VMWare-ESXI-5-5-host-cannot-be-added-to-VCenter-5-5.html

I realize I am running on older version of vCenter and need to update it to 3h version. The problem is I cannot download this update from MyVMware portal as when I click on download now this site says :

"You either are not entitled or do not have permissions to download this product.
Check with your My VMware Super User, Procurement Contact or Administrator.

If you recently purchased this product through VMware Store or through a third-party, try downloading later. "

And then it redirects me to 6.5 download. Since the infrasturcture I am supporting is on 5.5, I want to practise on the last version of 5.5 which is 3h.
Where can I download this newest version from ?
Nick PerksIT DirectorAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Is your vCenter Server build higher than or equal to ESXi otherwise your host is not compatible!
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Do you have valid support and subscription?
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Nick PerksIT DirectorAuthor Commented:
My ESXi hosts are running 5.5.0 VMkernel Release Build 32408547
and my Vsphere web version shows Version 5.5.0 Build 2175560

I am learning VMware and still new to it, I created myvmware account and downloaded all trials from there.
Only wanted to get used to 5.5 versions for now and not latest 6.5 as huge environment I am supporting is on 5.5 still.

I tried to download the latest vcenter 5.5 version but myvmware portal said I am not allowed to and redirects to 6.5, so not sure where to get the latest 5.5 version from.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Okay so you do not have access to 5.5

Therefore your options are to download current trial version which is 6.5
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