I switched over to manjaro and I have a subscription to KEEPSOLID VPN.
I looked at the instructions on the website on how to install on linux.
I tried all the commands, but I just cant get it installed onto manjaro.
would I just need to go back to Linux Mint?
That is up to you …
You can install this AUR package AUR (en) - vpn-unlimited
pamac build vpn-unlimited
Is a ready made PKGBUILD for the KeepSolid VPN service …
Bear in mind the Mint and Manjaro are 2 completely different distributions and the command for mint won’t necessarily work on Manjaro.
That said, look at what @bogdancovaciu showed you.
The minimum system requirement for installing a VPN application on your Linux device is Debian 10, Ubuntu 18.04, LinuxMint 19.3, MX Linux 19.3, or Zorin OS 15.3.
While that is not technically true of the software itself … it is true of both their packaging format (.deb) and their posted instructions - which overwhelmingly consists of commands only suitable to Debian-based Linux Distributions (Mint,Ubuntu,etc).
If you want to continue using Manjaro you should take some time to get familiar with how some things work - including software management in general.
Here is the wiki:
And here is something a lot of debuntu people find useful: