Hello, on Parallels Desktop website you can only purchase the latest version permanent license. For purchasing Parallels Desktop 16 permanent license kindly check with any 3rd party reseller like Amazon, eBay etc.
Hello, we sincerely apologize for the delay in response. Which Mac OS you are running? Kindly visit this Kb article and check if that Mac OS is compatible with Parallels Desktop 10.
Hello, is this your first purchase? After using trial version, you need to purchased full version of Parallels Desktop license key. Upgrade key only works, when you already have a previous version license key.
Hello, we would like to clarify that, it is not possible to migrate an Intel VM to a M1 Mac. But you can transfer the data from the Intel VM to a new VM created on M1 Mac by following this KB article.