Joomla 8.1 uploading extention com_sppagebuilder_pro_v2.3.1 causing it to crash

I purchased the Citilights - Premium Real Estate Template:
Transaction #: 11N47784BM539164W
Status: Paid
15 October 2017

I'm starting from the beginning and uploaded Joomla 8.1 to my site in a subfolder /Joomla, I can upload the template you gave me and the extentions with the exception of "com_sppagebuilder_pro_v2.3.1", on loading it it just causes Joomla to crash, and the error ...Error: 0 Call to undefined method JAdminCssMenu::addChild() appears on the grey tab of the page. I'm currently stuck as I don't know what to do from here. Not sure if it's a upgrade requirement or other issue.

Please let me know. If you require access I can give it.
Thanks,
Sean Collins