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Success! Thanks so much for the help, really appreciate it.

Unfortunately:
oem@Kevin:~$ sudo apt install suld-driver2-1.00.39
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
suld-driver2-1.00.39 : Depends: libusb-0.1-4 but it is not installable
E: Unable to correct problems, you have held broken packages.

You are right:o
em@Kevin:~/Downloads$ sudo dpkg -i suldr-keyring_2_all.deb
[sudo] password for oem:
(Reading database ... 201375 files and directories currently installed.)
Preparing to unpack suldr-keyring_2_all.deb ...
Unpacking suldr-keyring (2) over (2) ...
Setting up suldr-keyring (2) ...

But still I get:
Idle - File "/usr/lib/cups/filter/rastertospl" not available: No such file or directory

Understood, I did this a few years ago and it took a bit but it was not so messy.

Anyway,  i did
download it from https://www.bchemnet.com/suldr/pool/debian/extra/su/suldr-keyring_2_all.deb

But now I get
oem@Kevin:~$ sudo dpkg -i suldr-keyring_2_all.deb
[sudo] password for oem:
dpkg: error: cannot access archive 'suldr-keyring_2_all.deb': No such file or directory

I appreciate the help. This thing is driving me crazy

Regarding the driver - I installed suld-driver2-1.00.39, pulled out the driver I needed and deleted the rest (I did the same a few years ago)
Regarding the repository I get this:
sudo apt update
Hit:1 http://ppa.launchpad.net/transmissionbt/ppa/ubuntu focal InRelease
Hit:2 https://brave-browser-apt-release.s3.brave.com stable InRelease         
Hit:3 http://ppa.launchpad.net/ubuntuhandbook1/gimp/ubuntu focal InRelease     
Get:4 https://mega.nz/linux/MEGAsync/xUbuntu_20.04 ./ InRelease [2 441 B]     
Get:5 https://www.bchemnet.com/suldr debian InRelease [17,0 kB]           
Err:5 https://www.bchemnet.com/suldr debian InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FB510D557CC3E840
Reading package lists... Done
W: GPG error: https://www.bchemnet.com/suldr debian InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FB510D557CC3E840
E: The repository 'https://www.bchemnet.com/suldr debian InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Here they are:
oem@Kevin:~$ sudo apt list suld*
[sudo] password for oem:
Listing... Done
oem@Kevin:~$ ls -l /usr/lib/cups/filter/raster*
-rwxr-xr-x 1 root root 43248 mar 21  2020 /usr/lib/cups/filter/rastertobrlaser
-rwxr-xr-x 1 root root 22832 kwi 24  2020 /usr/lib/cups/filter/rastertoepson
-rwxr-xr-x 1 root root 35128 kwi 10  2020 /usr/lib/cups/filter/rastertoescpx
-rwxr-xr-x 1 root root 18736 kwi 24  2020 /usr/lib/cups/filter/rastertohp
-rwxr-xr-x 1 root root 22832 kwi 24  2020 /usr/lib/cups/filter/rastertolabel
-rwxr-xr-x 1 root root   563 kwi 10  2020 /usr/lib/cups/filter/rastertopclm
-rwxr-xr-x 1 root root 39240 kwi 10  2020 /usr/lib/cups/filter/rastertopclx
-rwxr-xr-x 1 root root 96680 kwi 10  2020 /usr/lib/cups/filter/rastertopdf
-rwxr-xr-x 1 root root 18760 kwi 10  2020 /usr/lib/cups/filter/rastertops
-rwxr-xr-x 1 root root 34816 lut 10  2018 /usr/lib/cups/filter/rastertoptch
-rwxr-xr-x 1 root root 18736 kwi 24  2020 /usr/lib/cups/filter/rastertopwg
-rwxr-xr-x 1 root root 15964 paź 31  2018 /usr/lib/cups/filter/rastertosag-gdi
oem@Kevin:~$

Hello, I recently had to reinstall Ubuntu 20.04 LTS.
I have set up Samsung M2022 printer in CUPS but no matter
what I try I get this message - please help?
Idle - "File "/usr/lib/cups/filter/rastertospl" not available: No such file or directory"