hi,
well if it is giving error then you can do a thing that
delate the plugin and download the latest one from here:
https://wplms.io/verify-purchase/?purchase_code=XXX&plugin=wplms.io/wplms.zip
change XXX with your purchase code and then upload with new zip in the plugins>>add new
please let me know the results
if you are unable to do the same then share your purchase code in private reply we will do it
thanks dear.