NextGen update causes blank screen

Hi, the latest update for NextGen that I attempted on my site resulted in a white blank screen across the board – no dashboard access, nothing. I’ve managed to deactivate the plugin (and others), all are happy reactivated except NextGen, which causes the blank screen all over again.

I’d like this fixed ideally, but if not, to be able to download version 2.0.74 which was working fine. NextGen’s own pages say it’s possible to rollback, but there’s no way to download old versions from the WordPress plugin page.

Please can someone help? (https://www.shospace.co.uk)

Thanks, Sheona