I've been using Fusion since Version 3, upgrading as needed. Since last year, 11.5.
Yesterday I installed Big Sur over Catalina. Today I went to the vmWare site to purchase the upgrade.
At this page: https://upgrade.vmware.com/drupgsns/controller.do?action=upgrade&sku=FUS12-PRO-UG-C&sssSKU=&productI...
vmWare says: Our records indicate that you have no registered products eligible for upgrade. To complete your order, register an eligible product then try again.
If I enter the license key there, vmWare sends me back to the page to purchase the product.
If instead, I click the registered link in this notice: If you do not see the serial number or license key below, confirm that you have registered the license.
then vmWare takes me to this page:
https://upgrade.vmware.com/account/secure/productRegistration.do?action=existingCustomer&fromSource=...
I enter my license key there and click Continue.
vmWare takes me to this page: https://upgrade.vmware.com/account/secure/registerMultipleProduct.do?action=registerMultipleProduct
Where it tells me:
Welcome, Joaquin
Unsuccessful Registration
The following key(s) were not registered due to errors. Please correct them or click the Skip Invalid Keys button to bypass their registration.
The license key is already registered. For information about how to gain access to the license key, see KB article 2015719.
Sadly, that KB article advises me: To work around this issue, contact the person who gave you the serial number or license key and ask to be added to the folder in which the license key resides.
Well, as you might suspect, no person gave me that license key, I got it from the vmWare robots. And I do not wish to be added to the folder in which the license key resides. That macOS folder stores only files. I can't, myself, be added to it.
However, the page does make other suggestions; namely it refers me to four support articles: 2016605, 2006985, 2011177, and 2017166. None of these are helpful.
In particular, the suggestion that I should pay for support in paying for a license upgrade is neither helpful nor friendly.
(That page is: https://kb.vmware.com/s/article/2006985 )
So I am unable to use two Microsoft Windows only applications essential to my life.
Of course, if I were not so stubborn, I would just agree to pay for support. And hope that part of the web site is more helpful that the part where long time customers try to pay for upgrades.