Is it possible to recover my rootsmagic 7 with my data
You can download and install the program again. The installer is at rootsmagic.com/download. Unless you manually deleted the folder where the data was stored, then it should still be there. If not, then you will need to restore from backup if you have one.
Your question is vague. A fresh download of RM7 will let you install the program if you have uninstalled it. If you want your RM7 data file after importing it to RM8 it is still where you had it on your computer. RM8 leaves the original alone and creates a new file for itself. Any changes you made since import to RM8 will not be in the RM7 file.