the big quote is from this link. This pretty much is how Solus says your situation must look like before attempting any install next to windows.
I should shut my yap now since I have never attempted this, but the ESP delete looks scary.
"Solus provides multiple ways you can install onto your system.
1)Solus can take up the entire drive, using traditonal root partitions, or with LVM-managed root partitions.
2) You can install Solus next to your existing operating system, such as Windows. If you have multiple operating systems installed, we will choose the largest option.
3)You can manually configure your system. This is only recommend for advanced users which may desire to have a dedicated /home partition. Note that if you manually configure your system, you will need to restart the Installer for those changes to apply appropriately. Note: Legacy (BIOS) must use MBR partition table while Unified EFI (UEFI) must use GPT partition table.
Alongside these options, we also provide the ability to use full-disk encryption. For the obvious reason of it being full-disk, this assumes you are installing Solus onto the entire drive.
If you are using a system with UEFI, you may need to create a EFI System Partition, also referred to as an ESP. This is not necessary if you are enabling Solus to install onto the entire disk.
To create an EFI System Partition, open up GParted and create a FAT32 partition that is 512MB in size. Next, right-click on the partition and click Manage Flags. On the Manage Flags section, enable the boot and esp flags.
Your system must be booted using Unified EFI (UEFI) mode, as opposed to a “legacy (BIOS) mode”.
Secure Boot needs to be disabled.
Your disk is required to be GPT formatted.
If you cannot see your SSD drive, set the SATA configuration to AHCI."
This is the condition you are supposed to begin installing in. I hope one of the forum users who has done this successfully will chime in.
edit: the bullet points did not survive cut and paste