Hi @Seuli Das Majumder ,
Did you apply the latest CU for SQL server 2017? Did you using the latest SSMS 18.7?
The Microsoft.SqlSever.SqlClrProvider.dll can be installed by running the following MSIs:
SQLSysClrTypes.msi
Microsoft.SqlServer.SqlManagementObjects.msi
You can get them from below links.
Microsoft® SQL Server® 2017 Feature Pack
Installing SMO
Please check if this similar thread Could not load file or assembly microsoft.sqlserver.sqlclrprovider 13.100.0.0. could help you.
Best regards,
Cathy
If the response is helpful, please click "Accept Answer" and upvote it.