For a detailed look on the new features and changes in v3.9.0, please have a look here: https://www.joomlaworks.net/blog/item/309-simple-image-gallery-pro-v3-9-0-released
SIGPro v3.9.1 released today adds a check if support of EXIF related functions is already built into your server's PHP setup. If not, any new features related to EXIF metadata which were introduced in v3.9.0 will simply be ignored.
For the record, affected users account to less than 0.2% in total of those upgraded to v3.9.0.
The JoomlaWorks demo site has been updated to the latest Simple Image Gallery Pro release. Have a look here: https://demo.joomlaworks.net/simple-image-gallery-pro
If you have an active Simple Image Gallery Pro membership, just head over to the Member Dashboard at https://www.joomlaworks.net/members and grab your copy from your "Subscriptions" page.
Or purchase this latest release from just 19.90 EUR. More info at: https://www.joomlaworks.net/extensions/commercial/simple-image-gallery-pro
Just upload the new version and it will overwrite the old one.
For more help, please visit the updated documentation page for the extension at: https://www.joomlaworks.net/support/docs/simple-image-gallery-pro
For support questions please use our Helpdesk system included in your Member Dashboard at https://www.joomlaworks.net/dashboard (active product membership required).