How have you come to know about your abortion being incomplete? If you had a desired pregnancy and have had bleeding or found the pregnancy not to grow, then you must have visited a gynecologist who must have advised you medicines or procedures to complete the abortion.
I must tell you, it is against law to prescribe tablets for abortion on online forums like this. Misoprostol tablets as mentioned by you are banned for sale on chemists shop and they are sold only after stringent record keeping and this record is under scrutiny of the drug inspectors.
Next Steps
It would be better to go to a gynecologist and get help from the doctor to diagnose and complete the abortion.
Health Tips
If you want to have tablets for completing an abortion , you must understand that many a times the abortion process doesnt get completed and in such cases surgical abortion also called DNC or curretage is done. If the abortion doesnt get completed, it may cause problems with future pregnancies too