i have that probem but, I had hamachi installed for a long time, and out of nowhere the network adapter, just one day the adapter disappeared, and tried reinstalling hamachi, using the CMD commands, and trying to install the adapter manually (which tells me that it can not find the file), I'm already frustrated, since I can not connect with my mates to play LAN :, (
How did you fix this problem. I have been working with the Support Services for over 6 hours over three days and they cannot seem to fix it. I wish they had a better escalation process. I am begging them to bump it to Level 3 support, Level 2 has worked on it for 2 hours. Never have I seen any tech run 'hamachi-2.exe -add-tap "Hamachi"'. However I have run it several times, without error, but the adapter never shows up. I have also tried it in "administrator mode" for command prompt. No errors, no success. I have updated my windows 10 twice (two step process?). It is now Windows 10 20H2 which I believe is the latest. It doesn't seem to want to update anymore. Uninstalled Hamachi, reinstalled, same problem.
I can confirm this procedure does work for creating the necessary Network Adapter, but it may fail in some cases.
First of all, you should launch the Command Prompt as an administrator, else the command might fail.
Second, you should not issue the command before navigating to the proper folder which contains the hamachi-2.exe executable. You can navigate on the Command Prompt with the cd command.
Remember: this will only create a Network Adapter for Hamachi, and nothing else. If you already have a Network Adapter installed for Hamachi, this will not solve your problem.