I have paid the yearly "major" upgrade fees so far, around 80 Euro each. However, for the newest version which includes masking and tack sharp, they are asking for an incredible 188 Euro right now, which is a special price they say. I am definitely not going to upgrade at that price level. THey must have gone crazy if they think that normal users will pay for this.I dont believe the training is free. From what I understand is that it is part of their Subscription model
They offer both subscription based and one time purchase. I opted for the one times purchase as I dont need the training or the syncing and I dont want to pay for a subscription.
Like most software now (topaz, exposure, etc) there is an upgrade price with major upgrades (often yearly) if you want to have the new latest features (I suspect the new auto selection and sharpen ai will only be available in the next major version, requiring me to pay for the upgrade if I want those features) —- however the current version you have will always function and so you own it. For me, its quite different than PS or LR because you dont have an option to use their software at all unless you perpetually pay.
I currently am using an attached SSD drive for the cache files and data backup. I only keep software applications on my internal hard drive.