Both programmes open up Ok but I immediately get a dropdown box claiming that there is "no connection to the internet"
As explained in the comments on the GOTD download page, the developers' servers are overloaded &/or otherwise having problems. Because obviously this was unforeseen, there's no specific message hard coded in the app explaining what's going on -- PC Win Booster can't get through to talk to the server(s), so it shows a generic message about what can cause such a thing. :)
"The programme then seeks registration and will only scan in check mode but will NOT cleam unless it is registered at $25/40.
WHAT IS F R E E ABOURT THAT?"
Also as explained on the GOTD download page... the GOTD version of PC Win Booster is hard wired to contact their server(s) for a key -- this happens when the app is started. The GOTD wrapper [Setup.exe] likewise phones home to verify you're installing whatever app during the giveaway period for that app. If you install PC Win Booster today so the GOTD part works, the PC Win Booster activation is not similarly time limited -- from what's been posted you can start PC Win Booster tomorrow, & assuming traffic's died down & it makes the connection, it'll activate then.
As far as the prices shown to purchase PC Win Booster... This isn't *that* different from the normal version, and payment info has been left in the app, same as in the normal version. It's not an attempt to hold you hostage. OTOH GOTD apps do come with restrictions that are pretty clearly spelled out -- if you like & use a GOTD app you're encouraged to buy it to support the developers.
* * *
From the comments on the download page...
Installation & activation of PC Win Booster itself...
Add-on toolbars etc. were reported in the comments on the GOTD download page -- I only saw that if you use the CNET downloader to get the free PC Win Booster trial, & then it was the CNET downloader, not the app's installer that presented those options. That doesn't mean that some time in the past the PC Win Booster trial setup didn't give you those options, but it doesn't today. Regardless, there is no GOTD activation key as such, so downloading the trial won't get you anything but the trial.
Once you do install the GOTD version of PC Win Booster, when it's started it automatically tries to contact the developer's server(s) for a license key -- if it can't make the connection it pops up a window with the options to cancel or retry. You can click retry a few times, then if it hasn't gotten that key yet the message box goes away & you're shown another message with details on what won't work until you enter a key, & there are 3 buttons to close, register, & activate -- if you click activate & then click cancel on the activate pop-up, the retry message box re-appears. This morning several times PC Win Booster appeared to hang or stall as it was attempting to get the license key -- it seems that's just the overloaded server(s) as when I [finally] just left it alone when it hung after clicking the retry button, it did activate or register eventually.
Installation includes an older copy of Microsoft's C/C++ runtime installer -- there is a hotfix available from Microsoft, so visit Windows update after install. Also, the "msxml3a.dll" file is added to Windows' system folder -- I didn't see anything to hint that this would give anyone any problems, but if one of your critical apps uses XML you might want to check its operation after you install PC Win Booster.
RE: comments on PC Win Booster not canceling an operation immediately -- some apps, some installers, & Windows itself for that matter don't always respond quickly when they're in the middle of whatever task... if you want to kill something faster use Task Mgr or similar.
RE: comments on advertised awards... I didn't check out any alleged awards on the PC Win Booster site because to me those awards don't mean a whole lot [awards or their denial can too often be bought]. That said, many major sites have *separate* regional versions, & stuff like awards & reviews may or may not be shared among sister sites. While some developers do boast of awards they haven't received, some people do take a western centered approach, figuring if it's not on the US version of a site then it must not exist, & that's perhaps just as wrong. :)