Tumblr Widget – not loading since update and website move

I’m not sure if my tumblr page isn’t loading because the widget isn’t supported on this wordpress version, since we just updated to 4.3.1 or if I have done something since we moved the website to a new host.

I’ve read through other support threads and have tried suggestions, removing https:// along with a few others and contacted tumblr, but it doesn’t sound like it’s their end as we’ve been having this trouble for a while now.

Apologies if I’ve missed the answer in other threads, but if someone has some advice or is able to look at our site, I’d be most grateful.

https://www.watershedplus.com/latest-picture/

Many thanks in advance and best wishes,
Heather

https://www.ads-software.com/plugins/tumblr-widget-for-wordpress/