Premiere elements 12

Okay, all good advice.  I just made a test video with 21 on my home PC.  I then uploaded did to YouTube.  It seemed to go well and played fine.  I didn't have any new program issues. Now I'm thinking that it would okay to download and install it on the Laptop.  Since I did not get any discs with the new program, walk me through how to go about putting it on the LP.  My guess is that I go to the download site and download it.  Then at the installation it will ask me for a serial number.  Which I recorded.  Is that bacsically all I have to do?  I'm not sure where the download site it though.

I'm not having any issues with 12 at the moment.  I have it installed on my Home PC and on my laptop.  I use the laptop in the field when I'm shooting videos.  I just purchased 2021 and installed it on my PC.   The download and install was very tricky and time consuming.  I had to restart the install a couple of times.  But I think I now have it working properly.  I'm afraid to install it on the laptop until I figure the 2021 version out.  I don't want to be having trouble with it while out in the field with no help available.

Question, do I now have to uninstall the 12 version from my Home PC?  If not, can I still use that version if I have any problems with 21?

Don