Blockland could not write to key.dat file. Pls Help!

[Epos]

Ive only just reinstalled Blockland after roughly 2 years of not playing and I needed to insert my BL key so I can log into my account. But soon as I click "Unlock" an error message stating: "Blockland could not write to key.dat file. This can be caused by running the game from a read-only directory or CD-ROM." Idk what to do nor am I good with this kinda thing but ill to comply with any help given! Any help would be appreciated!

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[phflack]

is your blockland directory read-only?
is your key.dat file read-only?

[Conan]

right click your blockland folder, select properties. make sure the read only box is unchecked (if its a black square, that means some stuff inside the folder is read only, so uncheck it)