I can't install obsidian

I installed the Obsidian 0.9.15 version several days ago. But I couldn’t input letters in it. Then I deleted the related data of obsidian and uninstalled this software. Today I tried to install the Obsidian 0.9.17. The installment failed. How can I deal with this problem?

Can you tell me what was the error message or something related!

We are going to need way more detail to provide any kind of help. What platform are you using? What error messages have you seen? Where did you download the app from?