wanting me to purchase when i tried to access

ive installed it before and was able to access it. now its asking me to purchase. i rarely use it but i thought once ive installed it and had been using it, doesnt it need to just update it and continue how i access the app? it didnt even say that it was a trial app when i first downloaded it.

Llela about IBM Micromedex Drug Int., v1.59.0