Hello clio
The lensflare plugin does not have a version for the new krpano version (1.23). No one has been buying it for years and there is no funding to update it.
I will try to make a new version in my spare time, but I cannot give a specific date, unfortunately.
You can send me the invoice receipt to this email: krpanostore@cms4vr.com
When it is ready, I will send you a new version.
Piotr