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Hello there! I've been trying to download some remaining images and tokens but to not avail. I keep getting these messages:

WARN 2019-05-20 03:32:42,589 Image download for Ooze (ALA) failed - responseCode: 301
WARN 2019-05-20 03:32:44,241 Image download for Saproling (ALA) failed - responseCode: 301
WARN 2019-05-20 03:32:45,501 Image download for Skeleton (ALA) failed - responseCode: 301
WARN 2019-05-20 03:32:46,709 Image download for Soldier (ALA) failed - responseCode: 301
WARN 2019-05-20 03:32:47,906 Image download for Thopter (ALA) failed - responseCode: 301
WARN 2019-05-20 03:32:49,101 Image download for Zombie (ALA) failed - responseCode: 301
WARN 2019-05-20 03:32:50,344 Image download for Goblin Soldier (APC) failed -
WARN 2019-05-20 03:32:51,565 Image download for Bird Soldier (ARB) failed -
WARN 2019-05-20 03:32:52,792 Image download for Dragon (ARB) failed - responseCode: 301
WARN 2019-05-20 03:32:54,018 Image download for Lizard (ARB) failed - responseCode: 301
WARN 2019-05-20 03:32:55,356 Image download for Zombie Wizard (ARB) failed -
WARN 2019-05-20 03:32:56,595 Image download for Angel (AVR) failed - responseCode: 301
WARN 2019-05-20 03:32:57,850 Image download for Angel (AVR) failed - responseCode: 301
WARN 2019-05-20 03:32:59,068 Image download for Demon (AVR) failed - responseCode: 301
WARN 2019-05-20 03:33:00,236 Image download for Human (AVR) failed - responseCode: 301
WARN 2019-05-20 03:33:01,397 Image download for Human (AVR) failed - responseCode: 301

I also can't download Amonkhet Invocations and other promo/special sets. Please help me!!!

Alara's sets from your logs works fine (all downloads from scryfall source). For rare/promos -- that's ok for xmage to have ~1000 cards/tokens missing.

It's can be scryfall site limitations -- some users gets IP ban for too fast/many cards downloads at once. Try next day or change max images threads from 10 to 3: