Problems with Droopy - Online file transfer & sharing

Hello, good afternoon. I have been trying to install the Droppy - Online file transfer & sharing plugins. If I try to do it manually it gives me error 500. From the panel I don't get that option. I have also tried inserting AdSenser code and it gives me a 403 error, taking me out of the admin, could someone help me please?

Check error_log in installation folder, you will know what is the issue, error 500 can be related to anything like db issue, files permissions issue