Alg Read only

Recently, I received another user's road Alg, used it, and modified it, and at some point, the file started running only with Read-Only, so I couldn't work. Read-Write works fine on other users' computers, but can only run on other computers. The same phenomenon continues even if you set it to Free on the user's computer for the first time, save it, receive and run the file. Does anyone have any experience in solving this problem?