Virtual Programming Lab (plugin)

I am working on Moodle 3.10+. I am updating the VPL systematically. After the last update to VPL to ver. 3.4.3+ 2021052513 a problem appeared. I cannot save the file "Error creating file in VPL." when you replace the files in the mod directory with an older version - everything goes back to normal. but the next time I log into Moodle, I am forced to update