Let's answer your questions:
- It's easy. Just register the license code on your new pc again.
- You can use the version you've bought for unlimited time. But I'll only provide fixes and support for the latest version.
- I plan to release one version per year. I don't think it is similar to subscription. You can use Voukoder Pro 2 for unlimited time (if its still supported by windows, etc) , even if there are newer versions available. If it'd be subscription based you couldn't use it after the subscription expires.
- Yes, both can be installed in parallel.