There is available legally because the product is discontinued and was never open-source. Any website offering one is either scamming you or infecting you. The tool itself is obsolete and potentially harmful on modern Windows systems.
If you are looking for a serial number for version 2.5 specifically, you should know: Old Versions
VÖEN (Fiziki şəxs və ya məhdud məsuliyyətli cəmiyyət) uçota alınması üçün elektron ərizə formasını dolduraraq sürətli sorğu göndər
VÖEN AÇThere is available legally because the product is discontinued and was never open-source. Any website offering one is either scamming you or infecting you. The tool itself is obsolete and potentially harmful on modern Windows systems.
If you are looking for a serial number for version 2.5 specifically, you should know: Old Versions Cleanmem Pro 2.5 Serial Number