I'd like to uninstall Elements & Premier 2018

[LinusF]

But I had opnly a trial version and it has expired.  I do not have an acceptable serial number so I cannot get into either 2018 apps.  I do have a DVD version of Elements & Premier for 2020 but Elements, at least, which may install but the update which comes up dies with an error 301 which is not in the Adobe list.  

How should I proceed in clearing v 18 off the PC?

[Phinny]

See if this helps, Linus.

[Peru Bob]

Use the Adobe Cleaner Tool:

cleaner-tool-