Problem opening files in v5.2.6

When I updated to V5.2 6 (Windows 10 64 bit) every time I tried to open an office file I got a dialogue telling me it was locked for editing by me on another system. I’ve now uninstalled that version and re-installed v 5.2.5 and can once again open files and edit them without problems.
Any suggestions as to how to successfully move to v 5.2.6 ?

After install the new version, please try resetting the user profile, sometimes solves strange issues.
Usually it’s enough renaming/deleting the file “user/registrymodifications.xcu”, it affects all the options in Menu/Tools/Options, and the files “user/basic/dialog.xlc” and “scrip.xlc” are overwritten, additionally custom colors in “user/config/standard.soc” are lost.