I wouldn't think so. Most games show their version in the lower left corner of the console. I haven't played Risen since before the patch was released though...
There should be a file called 'RisenPatch_Changelog.txt' in the Risen folder. You could also right-click on Risen.exe in the bin folder - if the date modified is recent then you must have patched it.
I found a way to do it... if you alt+tab out of risen, it will show the version in the taskbar...... looks like it is a bit tricky even if you install the 1.10 patch, the version is acctually 1.0989365 or something like that.... I guess they round it to 1.10