How to get entire line that contains given string using findstr in batch script?

Question

I need to get the line that contains the keyword ProductVersion from one of my svn repository csproj files. I have tried below code, but it is not working as expected.

The batch file is:

@echo off
setlocal enabledelayedexpansion
rem https://testur/test.csproj
for %%t in (%*) do (
    rem echo url: %%t
    for /f "tokens=1" %%c in ('svn cat %%t ^| findstr /i ProductVersion') do (
        echo output: %%c
    )
)

csproj file content:

<VisualStudioProject>
    <CSHARP
        ProjectType = "Local"
        ProductVersion = "7.10.3077"
        Schemaversion = "2.0"

Here the url is passed as command line argument to the batch file. The ProductVersion line in csproj file also contains = and some spaces. svn cat %%t would return me the content of file test.csproj. I am applying findstr on the received file content. When I tried with above code it returns only ProductVersion without the remaining string "7.0.3077" as output.

How to get the ProductVerion value 7.0.3077 or the entire line?