Once you download the Dose for Excel software you extract it using winrar and then open the extracted folder, you will find (Dose for Excel.exe) file as shown in the below image which apply on 32 bit / 64 bit, double click on it to start installation.
The installation starts a window like in below image, keep clicking on Nextbutton:
The installation finishes successfully like in below image:
After that you will find the dose for excel installed as Add-In adding a new 2 tabs on excel ribbon called D-EDITING and D-DATA like in the below image:
Once you open an Excel workbook then another installation of Dose for Excel VSTO will start, click on install and that's it :