Mulitsite Installations?

The free version can be used on multisites: Their limited features has no effects on this.
With the PRO-Version you can store Templates in the database for using it on multiple pages / blogentries. As these Templates are stored site by site multisite Management comes into the game. PRO-Versions prior to 2.0.9 do not support multisite. Versions after 2.0.9 are multisite ready.

Thanks to Rod from Canada and Layth from Australia!

Version 3.4.12 (February 22 2019), see in detail here:

bugfix 1: Now you can use HTML-Entities in the Template-Code (before those were converted in the textarea), e. g. ">"
bugfix 2: Better Infomessage before the 1st Licence-Check is done
bugfix 3: Creating CustomPostTypes: If "deleteold" is not "yes", both old and new CPT are available. This previously didn't work as it should.
bugfix 4: Using Shortcode-Parameter "maskspecialcharsinjson=no" now really works as it should (importaint when special chars are in the JSON)
rearranged code for better handling (twig, cache, debug-messages)
plugin ok with wp 5.1

Version 3.4.11 (January 14 2019), see in detail here:

plugin suggests you twig-templatecode: If there is no twig-template: the plugin looks into the JSON and suggests a template displaying the whole data
better creating custom-post-types: when creating custom-post-types you can use twig-code in the title, slug, custom fields and in the template. with the placeholder #SQM# you can add ' in custom-field-values when creating custom-post-types. E. g. this is needed when you want to format data there (like date or number)
better caching-handling: via the plugin-option "Settings" you now can switch of the twigcacher (which was previous always on) and clear the cache completely (see "Check Installation", previous the twigcache wasn't cleared)
bugfix 1: converting XML now works in more situations
bugfix 2: Check JCI-template-db if flag is not set. If ok set flag. Then an unneded error warning vanishs.
bugfix 3: when using displayapireturn=1 (wrap api-response in JSON if API does not give JSON) and the API gives 0 this failed before. E. g. this is needed if an API gives pure imagedata.
rearranged code for better handling (twig, cache, debug-messages)
plugin ok with wp 5.0.3