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Those who have already upgraded to 2.0.9.1 can simply overwrite your XOOPS with the files included in 2.0.9_to_2.0.9.2. However there might be some minor problems with the uploader and the block administration. If you do have problems with them, you can do the following:
Uploader problem: apply the patch posted by Mith on this thread or simply replace class/uploader.php with the one included in 2.0.9.
Block administration problem: edit and save all your blocks. If you have already done that when upgrading to 2.0.9.1, I am afraid you would need to that again.