jitesh-mandal Could you please tell me after installing 4.0 ISO file can we update.. ???
Yes. Solus is a rolling release. Solus 4.0 will update to Solus 4.3 in normal course, and stay current thereafter. I think you said that you downloaded the 4.3 ISO, though, so you will be current when you install/update.
jitesh-mandal But I am in a trouble I can't install solus just because installation app stuck over examining ...
That suggests to me that it would be a good idea to clean/initialize/format the target drive at this point because something isn't right.
Make sure that the target drive is GPT formatted. Is the target an NVMe drive (usually M.2) or a SATA drive (usually 2.5" SSD or HHD)? If the later, you might consider going into your BIOS and setting the SATA configuration to AHCI. That is sometimes necessary.