MediBang Paint Pro is packed with features but, that does not hinder them to provide a sleek and lightweight application that runs smoothly without slowing down your computer. I haven't tested it but according to this page on the WineDB the pen pressure does not work, to fix it it suggests 'if you want pen pressure you have to open the misc. Apart from that, it also provides tons of fonts as well as 800 pre-made tones and backgrounds, all of these are free to use. Sometimes it takes a few seconds and it will return to the same screen, select 'I don't want to add another shortcut.' and click Next. You will then be asked to add a shortcut, select sai.exe and click Next. Run the installer once it opens, when it is finished click OK and it will close. You will then be asked to select the installer, I used the trial from the PTS website version 1.2.5. Once you paste the text, on the following. In the next screen Wine will configure for a few moments and then the settings screen will open,under the 'Applications' tab change the 'Windows Version' to 'Windows XP', then click OK. There is no way you can add text with the program Paint Tool Sai, but you can copy and paste from a text document. In the next screen select '32 bits windows installation'. When asked to choose a version of Wine, select '2.12-staging'. Tick both 'Use another version of Wine', and 'Configure Wine'. Select 'Install a program in a new virtual drive'. Open PlayOnLinux and select 'Install a Program' on the left.

I have just tried this with PlayOnLinux using WindowsXP wine config and version 2.12 staging it is working.

Paint sai