Quick note on the patch. In itch every download will get it's on folder.
My download order was: Manual, game, patch
Thus the manual for me is:
C:\Users\<username>\AppData\Roaming\itch\apps\a-summers-end
While the game is in:
C:\Users\<username>\AppData\Roaming\itch\apps\a-summers-end 2
and thepatch was then downloaded in:
C:\Users\<username>\AppData\Roaming\itch\apps\a-summers-end 3
For the patch to work, copy the patchfile in the folder the game is in, but unlike Steam, not in the same folder as the executable (HK1986.exe), but rather in the subfolder "game"
For me that would be:
C:\Users\<username>\AppData\Roaming\itch\apps\a-summers-end 2\game
If you didnt start with downloading the manual its probably
C:\Users\<username>\AppData\Roaming\itch\apps\a-summers-end\game
This is the same folder that holds "archive.rpa"
Enjoy <3