When I try to start up LR (4.4) I get 'assertion failed'.

I have read what is said about the problem in this forum. However the solutions mentioned do not work, the seem to be mainly for LR5.4.I have LR  4.4 / 64 bits on a PC with Windows.
I have opened the same catalog with the same version of LR some days ago before shutting down the computer. Startup as administrator does not work. My Pictures directory is in the place it should be. (also not changed). I managed to startup another catalog and then tried to swith to my main catalog.
That failed and since then I can not open any catalog, including various backups, so it is not the catalog that is corrupt. Ofcourse I restarted the PC several times. I can also acces my roaming data.
Theo Molenaar the Netherlands

Thanxs
I think you are right. It says it cannot imort the catalog because it was closed improperly. And it says I have to de an integrity check upon opening. I do not know how to do that.
Strangely I can import the other catalog LR could not open and also the backups that I could not open.. However I have done some work since the last backup. So how do I do an integrity check on opening?

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