A: No. Summertime Saga is freeware. While the developer accepts Patreon donations to support development, the -UPD- version for PC is free to download. Never pay for a direct download link.
The screen stayed dark for a second, then roared back to life with a strange, violet hue. Instead of his desktop, the monitor displayed the familiar art style of the game, but the characters weren't static. They were looking at him. Specifically, Debbie was waving from the kitchen window of the home screen.
If you want option 2–4 and you’re in a specific country where availability differs, say your country and I’ll include location-specific notes.