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Starting with version 0.17.63, this save will no longer load, but can still be loaded and ran with 0.17.62 without issue.

Error while running event level::on_load()
An interface already exists under with name: freeplay
stack traceback:
...ata/Roaming/Factorio/temp/currently-playing/freeplay.lua:63: in function 'add_remote_interface'
__core__/lualib/event_handler.lua:26: in function 'register_events'
__core__/lualib/event_handler.lua:70: in function <__core__/lualib/event_handler.lua:64>
stack traceback:
[C]: in function 'add_interface'
...ata/Roaming/Factorio/temp/currently-playing/freeplay.lua:63: in function 'add_remote_interface'
__core__/lualib/event_handler.lua:26: in function 'register_events'
__core__/lualib/event_handler.lua:70: in function <__core__/lualib/event_handler.lua:64>
160.187 Loading map C:\Users\cmay\AppData\Roaming\Factorio\saves\hands_save7.zip: 20316615 bytes.
160.188 Loading level.dat: 52360387 bytes.
160.193 Info Scenario.cpp:187: Map version 0.17.62-0
161.558 Loading script.dat: 328 bytes.
161.560 Applying migration: Base Mod: 2019-08-05_Factorio_0.17.63.lua
161.614 Checksum for script C:/Users/cmay/AppData/Roaming/Factorio/temp/currently-playing/control.lua: 72150939
161.903 Error ParallelScenarioConverter.cpp:59: Error while running reload_script: The scenario level caused a non-recoverable error.
Please report this error to the scenario author.

Thanks for the report,

It is fixed for the next release,

And here is a fixed save game: