Resolved How to get started with Plastic in Unity2021? state of the art

I try different ways trying to start Plastic as version control for Unity.
I try so many options and follow video tutorials but fail.
I look at all the website video tutorials. There is no clear way.
I try the migration tool (from Collaborate) but I end up having this issue.

State of the art 2021
Who are the steps?

 

SOLUTION
Do not use the Plastic SCM that is in the asset store
Use the Plastic forum: https://forum.plasticscm.com/


Unity 2019LTS

• Create a new Unity (2019LTS [OK]) project:
  • Do not use the Plastic SCM beta
  • Will be by default in Packages>Version Control>Editor>PlasticSCM

• Install and Open Plastic SCM editor
• in Workspace on top left > Create new Workspace
  • a new workspace window pops up
• Default repository [New...]
• Name of the repository: CloudRepository_YourProjectName
• Server: will be your name@cloud
• Press [OK]
• WorkspaceName: LocalWork_YourProjectName
• We already created a Unity project. Close the Unity project. Copy the path
• so in "Path on disk" put the project path
  • just in case using the [Browse] button
  • to get as for example c:\Unity\YourProject.
• Press [OK]
• will return to Plastic SCM
• press [Pending Changes] on the left under Main actions
• to submit you need first to select all files assets:
  • select [x]Added and private items, so all assets are selected
• Add a check-in comment
• press [Checkin]
• It will ask you for encryption
  • put a password and register it in some safe place
• It will make the push uploading all files to the cloud
• Return to Unity
• Is working fine. without switching to version control.
• But just in case go to the Project Settings
• Edit > Version Control and select Plastic

Unity 2020LTS

• Create a new Unity (2020.3.15f2) project in this case with "Mobile 2D"
  • Do not use the Plastic SCM beta
  • Will be by default in Packages>Version Control>Editor>PlasticSCM
• Install and Open Plastic SCM editor.
• In my case, I already have the client configuration ready. So there is an extra step here.
  
• in Workspace on the top left > Create new Workspace
  • a new workspace window pops up
• Default repository: click [New...]
  
• Name of the repository: CloudRepository_YourProjectName
  
• Server: will be your name@cloud
  
• Press [OK]
  
• WorkspaceName: LocalWorkspace_YourProjectName
• We already created a Unity project. Copy the path and close the Unity project.
  • so in "Path on disk" put the project path
  • just in case using the [Browse] button
  • to get as for example c:\Unity\YourProject.
• Press [OK]
• will return to Plastic SCM
• press [Pending Changes] on the left under Main actions
• to submit you need first to select all files assets:
  • select [x]Added and private items, so all assets are selected
  • wait for a second
• Add a check-in comment (I notice that there is no "Library" folder and that is good)
• press [Checkin]
• In my case, It did not ask for encryption
  • If so put a password and register it in some safe place
  • It will make the push uploading all files to the cloud
• Return to Unity
  
• Open Wiodow>Plastic SCM. Is working fine. without switching to version control.
• But just in case go to the Project Settings...
  
• Edit > Version Control and select Plastic

Next U2021 did not work because Plastic issue describe here

Unity 2021.1.16f1

• Create a new Unity project or an existing one:
  • Do not use the Plastic SCM beta.
  • Delete it if is in: Assets>Plugins>Plastic (delete "Plastic" folder)
  • I did not find it in Packages>Version Control>Editor>PlasticSCM
  • Go to Package Manager
  • Install Version Control
• Install and Open Plastic SCM editor
• Under Plastic SCM title, there is [Workspace....] on the top left
  • Is the first top-left corner button with a drop-down menu
  • select "Create new workspace..."
  • and a "New workspace" window will pop up
• in "Default repository:" click [New...]
  • a "New repository" window will pop up
• in "Name of the repository:" type for example CloudRepo_YourProjectName
• Server: will be your name@cloud
• Press [OK]
• in WorkspaceName: LocalWork_YourProjectName
• We already created a Unity project. Close the Unity project. Copy the path
• so in "Path on disk" put the project path
  • just in case using the [Browse] button
  • to get as for example c:\Unity\YourProject.
• Press [OK]
• If something is interfering a message will pop up
  • Do not copy, move the project or rename it because will not fix the problem
  • In my case, the following indications work
  • close Plastic SCM editor
  • delete the hidden ".plastic" folder that is inside the project
  • And then open and close the Unity project
  • open Plastic SCM editor
  • a "Welcome to Plastic" can pop up (because there is no configuration)
  • Use Centralized if is your case and follow the above indications.
  • Press [OK]
• Plastic SCM will open
• press [Pending Changes] on the left under Main actions
• to submit you need first to select all files assets:
  • select [x]Added and private items, so all assets are selected
  • sometimes you need to do this twice.
• Add a check-in comment
• press [Checkin] it will take some time to upload all files to the cloud
• If It will ask you for encryption
  • put a password and register it in some safe place
• Return/open Unity:
• open the Project Setting window
• go to Version Control and select Plastic
• must be "Connected"
• open Window > Plastic SCM
• click to [Launch branch explarer]
• now you can make a branch
  • In some cases, if the Library was compiled, you need to check in changes first